libpng: bump version

Fixes an unitialized-memory-read bug.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libpng/libpng-remove-setjmp-error.patch

@@ -1,17 +0,0 @@
-diff -ur libpng-1.2.25/pngconf.h libpng-1.2.25-patched/pngconf.h
---- libpng-1.2.25/pngconf.h	2008-02-18 16:31:05.000000000 -0600
-+++ libpng-1.2.25-patched/pngconf.h	2008-03-05 07:30:22.900478085 -0600
-@@ -319,13 +319,6 @@
- #      define PNG_SAVE_BSD_SOURCE
- #      undef _BSD_SOURCE
- #    endif
--#    ifdef _SETJMP_H
--     /* If you encounter a compiler error here, see the explanation
--      * near the end of INSTALL.
--      */
--         __pngconf.h__ already includes setjmp.h;
--         __dont__ include it again.;
--#    endif
- #  endif /* __linux__ */
- 
-    /* include setjmp.h for error handling */

package/libpng/libpng.mk

@@ -3,7 +3,7 @@
 # libpng (Portable Network Graphic library)
 #
 #############################################################
-LIBPNG_VERSION:=1.2.35
+LIBPNG_VERSION:=1.2.38
 LIBPNG_SITE = http://$(BR2_SOURCEFORGE_MIRROR).dl.sourceforge.net/sourceforge/libpng
 LIBPNG_SOURCE = libpng-$(LIBPNG_VERSION).tar.bz2
 LIBPNG_LIBTOOL_PATCH = NO