[libpng17] Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnnnnU in

png.h (Robert C. Seacord). Various other flags in png.h made unsigned as well.

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta79 - February 2, 2016
+Libpng 1.7.0beta79 - February 14, 2016
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -1239,7 +1239,7 @@ Version 1.7.0beta78 [January 23, 2016]
     32 bits of address space when size_t/ptrdiff_t are 64 bit types.
   Revised workaround for false-positive Coverity issue in pngvalid.c.
 
-Version 1.7.0beta79 [February 2, 2016]
+Version 1.7.0beta79 [February 14, 2016]
   Only use exit(77) in configure builds.
   Corrected error in PNG_IMAGE_PNG_SIZE_MAX. This new macro underreported
     the palette size because it failed to take into account that the memory
@@ -1255,6 +1255,13 @@ Version 1.7.0beta79 [February 2, 2016]
     have the text chunks.
   Expanded search logging in pngcp to output results during the search;
     sufficient for basic tests on zlib parameters.
+  More sophisticated default write compression options, which helps
+    significantly for some files along with code to make it easier to control
+    the compression defaults and to make the settings honor the API calls
+    the application makes (previously low windowBits settings would get reset
+    to higher values.)
+  Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnnnnU in png.h
+   (Robert C. Seacord). Various other flags in png.h made unsigned as well.
 
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