external/libpng 1.2.29

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diff --git a/contrib/pngsuite/README b/contrib/pngsuite/README
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+
+pngsuite
+--------
+(c) Willem van Schaik, 1999
+
+Permission to use, copy, and distribute these images for any purpose and
+without fee is hereby granted.
+
+These 15 images are part of the much larger PngSuite test-set of 
+images, available for developers of PNG supporting software. The 
+complete set, available at http:/www.schaik.com/pngsuite/, contains 
+a variety of images to test interlacing, gamma settings, ancillary
+chunks, etc.
+
+The images in this directory represent the basic PNG color-types:
+grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
+(1-8 bit) and grayscale or color images with alpha channel. You
+can use them to test the proper functioning of PNG software.
+
+    filename      depth type
+    ------------ ------ --------------
+    basn0g01.png  1-bit grayscale
+    basn0g02.png  2-bit grayscale
+    basn0g04.png  4-bit grayscale
+    basn0g08.png  8-bit grayscale
+    basn0g16.png 16-bit grayscale
+    basn2c08.png  8-bit truecolor
+    basn2c16.png 16-bit truecolor
+    basn3p01.png  1-bit paletted
+    basn3p02.png  2-bit paletted
+    basn3p04.png  4-bit paletted
+    basn3p08.png  8-bit paletted
+    basn4a08.png  8-bit gray with alpha
+    basn4a16.png 16-bit gray with alpha
+    basn6a08.png  8-bit RGBA
+    basn6a16.png 16-bit RGBA
+
+Here is the correct result of typing "pngtest -m *.png" in
+this directory:
+
+Testing basn0g01.png: PASS (524 zero samples)
+ Filter 0 was used 32 times
+Testing basn0g02.png: PASS (448 zero samples)
+ Filter 0 was used 32 times
+Testing basn0g04.png: PASS (520 zero samples)
+ Filter 0 was used 32 times
+Testing basn0g08.png: PASS (3 zero samples)
+ Filter 1 was used 9 times
+ Filter 4 was used 23 times
+Testing basn0g16.png: PASS (1 zero samples)
+ Filter 1 was used 1 times
+ Filter 2 was used 31 times
+Testing basn2c08.png: PASS (6 zero samples)
+ Filter 1 was used 5 times
+ Filter 4 was used 27 times
+Testing basn2c16.png: PASS (592 zero samples)
+ Filter 1 was used 1 times
+ Filter 4 was used 31 times
+Testing basn3p01.png: PASS (512 zero samples)
+ Filter 0 was used 32 times
+Testing basn3p02.png: PASS (448 zero samples)
+ Filter 0 was used 32 times
+Testing basn3p04.png: PASS (544 zero samples)
+ Filter 0 was used 32 times
+Testing basn3p08.png: PASS (4 zero samples)
+ Filter 0 was used 32 times
+Testing basn4a08.png: PASS (32 zero samples)
+ Filter 1 was used 1 times
+ Filter 4 was used 31 times
+Testing basn4a16.png: PASS (64 zero samples)
+ Filter 0 was used 1 times
+ Filter 1 was used 2 times
+ Filter 2 was used 1 times
+ Filter 4 was used 28 times
+Testing basn6a08.png: PASS (160 zero samples)
+ Filter 1 was used 1 times
+ Filter 4 was used 31 times
+Testing basn6a16.png: PASS (1072 zero samples)
+ Filter 1 was used 4 times
+ Filter 4 was used 28 times
+libpng passes test
+
+Willem van Schaik
+<willem@schaik.com>
+October 1999
diff --git a/contrib/pngsuite/basn0g01.png b/contrib/pngsuite/basn0g01.png
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index 0000000..e31e1c7
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+++ b/contrib/pngsuite/basn0g01.png
diff --git a/contrib/pngsuite/basn0g02.png b/contrib/pngsuite/basn0g02.png
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index 0000000..68809dd
--- /dev/null
+++ b/contrib/pngsuite/basn0g02.png
diff --git a/contrib/pngsuite/basn0g04.png b/contrib/pngsuite/basn0g04.png
new file mode 100644
index 0000000..6fa089c
--- /dev/null
+++ b/contrib/pngsuite/basn0g04.png
diff --git a/contrib/pngsuite/basn0g08.png b/contrib/pngsuite/basn0g08.png
new file mode 100644
index 0000000..bf522ee
--- /dev/null
+++ b/contrib/pngsuite/basn0g08.png
diff --git a/contrib/pngsuite/basn0g16.png b/contrib/pngsuite/basn0g16.png
new file mode 100644
index 0000000..318ebca
--- /dev/null
+++ b/contrib/pngsuite/basn0g16.png
diff --git a/contrib/pngsuite/basn2c08.png b/contrib/pngsuite/basn2c08.png
new file mode 100644
index 0000000..21d2f91
--- /dev/null
+++ b/contrib/pngsuite/basn2c08.png
diff --git a/contrib/pngsuite/basn2c16.png b/contrib/pngsuite/basn2c16.png
new file mode 100644
index 0000000..1bd4a4d
--- /dev/null
+++ b/contrib/pngsuite/basn2c16.png
diff --git a/contrib/pngsuite/basn3p01.png b/contrib/pngsuite/basn3p01.png
new file mode 100644
index 0000000..a21db59
--- /dev/null
+++ b/contrib/pngsuite/basn3p01.png
diff --git a/contrib/pngsuite/basn3p02.png b/contrib/pngsuite/basn3p02.png
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index 0000000..1d0ab61
--- /dev/null
+++ b/contrib/pngsuite/basn3p02.png
diff --git a/contrib/pngsuite/basn3p04.png b/contrib/pngsuite/basn3p04.png
new file mode 100644
index 0000000..6dc6eac
--- /dev/null
+++ b/contrib/pngsuite/basn3p04.png
diff --git a/contrib/pngsuite/basn3p08.png b/contrib/pngsuite/basn3p08.png
new file mode 100644
index 0000000..0e07f48
--- /dev/null
+++ b/contrib/pngsuite/basn3p08.png
diff --git a/contrib/pngsuite/basn4a08.png b/contrib/pngsuite/basn4a08.png
new file mode 100644
index 0000000..3bb0dd0
--- /dev/null
+++ b/contrib/pngsuite/basn4a08.png
diff --git a/contrib/pngsuite/basn4a16.png b/contrib/pngsuite/basn4a16.png
new file mode 100644
index 0000000..6dbee9f
--- /dev/null
+++ b/contrib/pngsuite/basn4a16.png
diff --git a/contrib/pngsuite/basn6a08.png b/contrib/pngsuite/basn6a08.png
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index 0000000..6106230
--- /dev/null
+++ b/contrib/pngsuite/basn6a08.png
diff --git a/contrib/pngsuite/basn6a16.png b/contrib/pngsuite/basn6a16.png
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index 0000000..a9bf3cb
--- /dev/null
+++ b/contrib/pngsuite/basn6a16.png