PYTHON_GEN is defined to the exact same thing in both
Makefile.glsl.am and Makefile.nir.am. This makes automake complain,
so let's lift the definition up to Makefile.am, the same way as
MKDIR_GEN.
Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Tested-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>