libs/libexif: Disable nls

Fixes missing @MKINSTALLDIRS@ substitution in po/Makefile.

Signed-off-by: Alin Nastac <alin.nastac@gmail.com>

libs/libexif/Makefile

@@ -41,6 +41,7 @@ CONFIGURE_ARGS+= \
 	--enable-shared \
 	--enable-static \
 	--disable-rpath \
+	--disable-nls \
 	--without-libiconv-prefix \
 	--without-libintl-prefix \