File use_system_libs_libpng15.patch of Package freeimage

diff -Naur FreeImage/Source/FreeImage/PluginPNG.cpp FreeImage.libpng15/Source/FreeImage/PluginPNG.cpp
--- FreeImage/Source/FreeImage/PluginPNG.cpp	2012-02-19 03:33:18.000000000 +0200
+++ FreeImage.libpng15/Source/FreeImage/PluginPNG.cpp	2012-10-28 20:37:00.786892452 +0200
@@ -37,8 +37,8 @@
 
 // ----------------------------------------------------------
 
-#include "../ZLib/zlib.h"
-#include "../LibPNG/png.h"
+#include <zlib.h>
+#include <png.h>
 
 // ----------------------------------------------------------
 
@@ -106,7 +106,11 @@
 			tag = FreeImage_CreateTag();
 			if(!tag) return FALSE;
 
+#ifdef PNG_iTXt_SUPPORTED
 			DWORD tag_length = (DWORD) MAX(text_ptr[i].text_length, text_ptr[i].itxt_length);
+#else
+			DWORD tag_length = text_ptr[i].text_length;
+#endif
 
 			FreeImage_SetTagLength(tag, tag_length);
 			FreeImage_SetTagCount(tag, tag_length);
@@ -153,9 +157,11 @@
 			text_metadata.key = (char*)FreeImage_GetTagKey(tag);	// keyword, 1-79 character description of "text"
 			text_metadata.text = (char*)FreeImage_GetTagValue(tag);	// comment, may be an empty string (ie "")
 			text_metadata.text_length = FreeImage_GetTagLength(tag);// length of the text string
+#ifdef PNG_iTXt_SUPPORTED
 			text_metadata.itxt_length = FreeImage_GetTagLength(tag);// length of the itxt string
 			text_metadata.lang = 0;		 // language code, 0-79 characters or a NULL pointer
 			text_metadata.lang_key = 0;	 // keyword translated UTF-8 string, 0 or more chars or a NULL pointer
+#endif
 
 			// set the tag 
 			png_set_text(png_ptr, info_ptr, &text_metadata, 1);
@@ -175,9 +181,11 @@
 		text_metadata.key = (char*)g_png_xmp_keyword;					// keyword, 1-79 character description of "text"
 		text_metadata.text = (char*)FreeImage_GetTagValue(tag);	// comment, may be an empty string (ie "")
 		text_metadata.text_length = FreeImage_GetTagLength(tag);// length of the text string
+#ifdef PNG_iTXt_SUPPORTED
 		text_metadata.itxt_length = FreeImage_GetTagLength(tag);// length of the itxt string
 		text_metadata.lang = 0;		 // language code, 0-79 characters or a NULL pointer
 		text_metadata.lang_key = 0;	 // keyword translated UTF-8 string, 0 or more chars or a NULL pointer
+#endif
 
 		// set the tag 
 		png_set_text(png_ptr, info_ptr, &text_metadata, 1);
@@ -599,7 +607,9 @@
 				row_pointers[height - 1 - k] = FreeImage_GetScanLine(dib, k);			
 			}
 
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
 			png_set_benign_errors(png_ptr, 1);
+#endif
 			png_read_image(png_ptr, row_pointers);
 
 			// check if the bitmap contains transparency, if so enable it in the header