- fix build with giflib 4.2.0

svn path=/head/; revision=298049

graphics/swftools/files/patch-gif2swf.c

@@ -0,0 +1,37 @@
+--- src/gif2swf.c.orig	2011-01-02 04:30:29.000000000 +0100
++++ src/gif2swf.c	2012-06-03 06:43:44.000000000 +0200
+@@ -65,6 +65,16 @@
+     RESTORE_TO_PREVIOUS
+ };
+ 
++static void
++localPrintGifError(void)
++{
++    char *Err = GifErrorString();
++
++    if (Err != NULL)
++        fprintf(stderr, "\nGIF-LIB error: %s.\n", Err);
++    else
++        fprintf(stderr, "\nGIF-LIB undefined error %d.\n", GifError());
++}
+ 
+ void SetFrameAction(TAG ** t, const char *src, int ver)
+ {
+@@ -236,7 +246,7 @@
+     }
+ 
+     if (DGifSlurp(gft) != GIF_OK) {
+-        PrintGifError();
++        localPrintGifError();
+         return t;
+     }
+ 
+@@ -499,7 +509,7 @@
+         global.max_image_height = gft->SHeight;
+ 
+     if (DGifSlurp(gft) != GIF_OK) { 
+-        PrintGifError();
++        localPrintGifError();
+         return -1;
+     }
+     // After DGifSlurp() call, gft->ImageCount become available