freedreno: automake: correctly set MKDIR_GEN

Analogous to previous commit.

Fixes: 4610e5ef28e "freedreno/ir3: fix sin/cos"
Cc: "12.0 13.0" <mesa-dev@lists.freedesktop.org>
Cc: Rob Clark <robclark@freedesktop.org>
Cc: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Reported-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
(cherry picked from commit a922c821255bfac22cf705244e5bd303a626bb55)
1 file changed