Currently we use DISTCHECK_CONFIGURE_FLAGS, which is reserved for
the user. As with other variables, one should use the AM_ variable
within the makefile.
Cc: "10.5" <mesa-stable@lists.freedesktop.org> Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com> Reviewed-by: Matt Turner <mattst88@gmail.com>