libextractor: build giflib plugin

Cherry-picked r34095 'Add giflib-5.1.0 compatibility' into patches to
fix build against recent versions of giflib.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

libs/libextractor/Makefile

@@ -9,10 +9,10 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libextractor
 PKG_VERSION:=1.3
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 # ToDo:
-# - package missing optional dependencies: libexiv2, giflib, gsf, librpm, smf, tidy
+# - package missing optional dependencies: libexiv2, gsf, librpm, smf, tidy
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
@@ -29,6 +29,7 @@ PLUGINS:= \
 	deb \
 	dvi \
 	flac:+libflac \
+	gif:+giflib \
 	gstreamer:+libgstreamer1:+libgst1app:+libgst1pbutils:+libgst1tag \
 	it \
 	jpeg:+libjpeg \

libs/libextractor/patches/001-backport-support-for-giflib-5-1.patch

@@ -0,0 +1,26 @@
+--- a/src/plugins/gif_extractor.c
++++ b/src/plugins/gif_extractor.c
+@@ -78,7 +78,11 @@ EXTRACTOR_gif_extract_method (struct EXT
+   if (gif_file == NULL || gif_error != 0)
+   {
+     if (gif_file != NULL)
++#if GIFLIB_MAJOR < 5 || GIFLIB_MINOR < 1
+       EGifCloseFile (gif_file);
++#else
++      EGifCloseFile (gif_file, NULL);
++#endif
+     return; /* not a GIF */
+   }
+ #endif
+@@ -133,7 +137,11 @@ EXTRACTOR_gif_extract_method (struct EXT
+ 	       DGifGetExtensionNext(gif_file, &ext)) &&
+ 	      (NULL != ext) ) ; /* keep going */
+     }
++#if defined (GIF_LIB_VERSION) || GIFLIB_MAJOR < 5 || GIFLIB_MINOR < 1
+   DGifCloseFile (gif_file);
++#else
++  DGifCloseFile (gif_file, NULL);
++#endif
+ }
+ 
+ /* end of gif_extractor.c */