Add libpng 1.4.0

This is a clean copy of libpng 1.2.40, except that the contribs
directory has been removed, as usual. Our build modifications
will follow in a separate commit.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/3rdparty/libpng/test-pngtest.sh b/src/3rdparty/libpng/test-pngtest.sh
new file mode 100755
index 0000000..c134a8a
--- /dev/null
+++ b/src/3rdparty/libpng/test-pngtest.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+./pngtest ${srcdir}/pngtest.png