wrlib: Use a Conditional for GIF in the makefile instead of #if in source

The use of the conditionals provided by autotools provides a better result
as they avoid unnecessary compilation.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>

wrlib/Makefile.am

@@ -40,9 +40,11 @@ libwraster_la_SOURCES = 	\
 	ppm.c		\
 	png.c 		\
 	jpeg.c 		\
-	tiff.c		\
-	gif.c
+	tiff.c
 
+if USE_GIF
+libwraster_la_SOURCES += gif.c
+endif
 
 LTCOMPILE2=`echo $(LTCOMPILE) | sed -e s/-fomit-frame-pointer//`
 COMPILE2=`echo $(COMPILE) | sed -e s/-fomit-frame-pointer//`

wrlib/gif.c

@@ -22,8 +22,6 @@
 
 #include <config.h>
 
-#ifdef USE_GIF
-
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -209,5 +207,3 @@ RImage *RLoadGIF(const char *file, int index)
 
 	return image;
 }
-
-#endif				/* USE_GIF */