sdl_gfx: enable shared builds

src/sdl_gfx.mk

@@ -19,9 +19,7 @@ endef
 
 define $(PKG)_BUILD
     cd '$(1)' && ./configure \
-        --host='$(TARGET)' \
-        --disable-shared \
-        --prefix='$(PREFIX)/$(TARGET)' \
+        $(MXE_CONFIGURE_OPTS) \
         --with-sdl-prefix='$(PREFIX)/$(TARGET)'
     $(MAKE) -C '$(1)' -j '$(JOBS)' install bin_PROGRAMS= sbin_PROGRAMS= noinst_PROGRAMS=
 
@@ -30,5 +28,3 @@ define $(PKG)_BUILD
         '$(2).c' -o '$(PREFIX)/$(TARGET)/bin/test-sdl_gfx.exe' \
         `'$(TARGET)-pkg-config' SDL_gfx --cflags --libs`
 endef
-
-$(PKG)_BUILD_SHARED =