[Cleanup] gtk3: disable use of to-pixdata during build

[heitbaum]

use @5schatten suggestion to fix build issues of chrome, instead of patching it out.

gtk3: disable use of to-pixdata during build

86f4306

post_makeinstall_host() {
  ${TOOLCHAIN}/bin/gdk-pixbuf-query-loaders > ${TOOLCHAIN}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache
}