We don't need a version number in the library name itself, on top of the SO
number.

Index: Makefile.in
--- Makefile.in.orig
+++ Makefile.in
@@ -306,7 +306,6 @@ EXTRA_DIST = \
 
 libSDL2_gfx_la_LDFLAGS = \
 	-no-undefined		\
-	-release $(LT_RELEASE)	\
 	-version-info $(LT_CURRENT):$(LT_REVISION):$(LT_AGE)
 
 pkgconfigdir = $(libdir)/pkgconfig