configure.ac: strip out the llvm-config -march/mtune flags

Otherwise drivers such as SWR that depend on providing their own values
will fail to build.

v2: Add -mcpu for good measure (Chuck)

Cc: "11.2 12.0" <mesa-stable@lists.freedesktop.org>
Cc: Tim Rowley <timothy.o.rowley@intel.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Chuck Atkins <chuck.atkins@kitware.com>
Tested-by: Chuck Atkins <chuck.atkins@kitware.com>
1 file changed