Contribs: update libpng-osx.patch.

extras/contrib/src/Patches/libpng-osx.patch

-diff -ruN libpng-1.2.30/scripts/makefile.darwin libpng/scripts/makefile.darwin
---- libpng-1.2.30/scripts/makefile.darwin	2008-08-15 16:14:44.000000000 +0200
-+++ libpng/scripts/makefile.darwin	2008-08-20 01:48:40.000000000 +0200
-@@ -7,14 +7,14 @@
- # For conditions of distribution and use, see copyright notice in png.h
+diff -urN libpng-1.2.41/scripts/makefile.darwin libpng/scripts/makefile.darwin
+--- libpng-1.2.41/scripts/makefile.darwin       2009-12-03 04:46:02 +0300
++++ libpng/scripts/makefile.darwin       2009-12-04 14:37:52 +0300
+@@ -10,14 +10,14 @@
+ # and license in png.h
 
  # where "make install" puts libpng.a, libpng12.dylib, png.h and pngconf.h
 -prefix=/usr/local
@@ -21,18 +21,18 @@ diff -ruN libpng-1.2.30/scripts/makefile.darwin libpng/scripts/makefile.darwin
 
  # Library name:
  LIBNAME = libpng12
-@@ -39,8 +39,8 @@
+@@ -42,8 +42,8 @@
  RM_F=/bin/rm -f
 
  # CFLAGS=-I$(ZLIBINC) -W -Wall -O3 -funroll-loops -DPNG_NO_MMX_CODE
--CFLAGS=-I$(ZLIBINC) -W -Wall -O -funroll-loops
+-CFLAGS=-DPNG_CONFIGURE_LIBPNG -I$(ZLIBINC) -W -Wall -O -funroll-loops
 -LDFLAGS=-L. -L$(ZLIBLIB) -lpng12 -lz
-+CFLAGS=??EXTRA_CFLAGS?? -I$(ZLIBINC) -W -Wall -O -funroll-loops
++CFLAGS=-DPNG_CONFIGURE_LIBPNG ??EXTRA_CFLAGS?? -I$(ZLIBINC) -W -Wall -O -funroll-loops
 +LDFLAGS=??EXTRA_LDFLAGS?? -L. -L$(ZLIBLIB) -lpng12 -lz
 
  INCPATH=$(prefix)/include
  LIBPATH=$(exec_prefix)/lib
-@@ -73,7 +73,7 @@
+@@ -76,7 +76,7 @@
  .c.pic.o:
         $(CC) -c $(CFLAGS) -fno-common -o $@ $*.c
 
@@ -41,7 +41,7 @@ diff -ruN libpng-1.2.30/scripts/makefile.darwin libpng/scripts/makefile.darwin
 
  libpng.a: $(OBJS)
         $(AR_RC) $@ $(OBJS)
-@@ -182,7 +182,7 @@
+@@ -185,7 +185,7 @@
         chmod 755 $(DB)/$(LIBNAME)-config
         (cd $(DB); $(LN_SF) $(LIBNAME)-config libpng-config)