x11-wm/fvwm3: Fix librsvg2 dependency

For the SVG option, use USES=gnome to add the dependency to librsvg2,
enabling users to use the non-rust version setting DEFAULT_VERSIONS.

x11-wm/fvwm3/Makefile

@@ -59,9 +59,8 @@ PERL_CONFIGURE_ENABLE=	perllib
 PNG_LIB_DEPENDS=	libpng.so:graphics/png
 PNG_CONFIGURE_ENABLE=	png
 
-SVG_LIB_DEPENDS=	librsvg-2.so:graphics/librsvg2-rust
 SVG_USES=		gnome
-SVG_USE=		gnome=cairo,glib20,gdkpixbuf2
+SVG_USE=		gnome=cairo,glib20,gdkpixbuf2,librsvg2
 SVG_CONFIGURE_ENABLE=	rsvg
 
 XCURSOR_USE=			xorg=xcursor