configure: Prepend pixman and ftd flags to overrule system-provided ones Other packages may provide includes for pixman as well if the host has a devel package installed. So add ours to the front to unsure that the right version is used. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>