jhbuild: Pass --enable-nouveau-experimental-api to libdrm.
jhbuild: Pass --enable-nouveau-experimental-api to libdrm.

This option is needed to build xf86-video-nouveau, but is disabled by
default in libdrm. Let's make jhbuild able to build xf86-video-nouveau
by default.

Reviewed-by: Dan Nicholson <2570c412b7cbb4203ff39baaca2bd49e72848226@gmail.com>
Signed-off-by: Cyril Brulebois <78205c9762fa1e76455ffaa05c55e3fed035d793@debian.org>

freedesktop-unofficial-mirror/xorg__util__modular,freedesktop-unofficial-mirror/xorg__util__modular,freedesktop-unofficial-mirror/xorg__util__modular