gdk-pixbuf: fix nativesdk do_configure failed

Since commit [92fc2849 gdk-pixbuf: rewrite the cross-build support
for tests] applied, it add meson option -Duse_prebuilt_tools=true to
taget.

Add the same option for nativesdk to fix do_configure failure
|../gdk-pixbuf-2.42.6/thumbnailer/meson.build:32:0: ERROR: Arrays do not
have a method called 'full_path'

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>