gtk-icon-utils-native: Drop problematic dependency

The setscene [depends] support is nasty with hidden side effects, in particular hardcoding that the items mentioned basically always get installed from sstate. Installing librsvg-native ends up pulling in qemu-native and all kinds of things we don't want.

http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=e384d9ba0c4a3335575a766a82ed79201d794b11
was meant to resolve the reasons this dependency was present and I suspect I simply forgot to remove it at the time. Remove it now for much better sstate usage.

index 7882bb4..d4a169a 100644
@@ -58,6 +58,3 @@ do_install() {
 	create_wrapper ${D}/${bindir}/gtk-encode-symbolic-svg \
 		GDK_PIXBUF_MODULE_FILE=${STAGING_LIBDIR_NATIVE}/gdk-pixbuf-2.0/2.10.0/loaders.cache
 }
-
-# Prevent bitbake from optimizing away the native librsvg sysroot population
-do_populate_sysroot_setscene[depends] += "librsvg-native:do_populate_sysroot_setscene"