glapi: gl_x86_64_asm.py: Use argparse instead of getopt
glapi: gl_x86_64_asm.py: Use argparse instead of getopt

Also removes the redundant -m argument, which could only be set to
'generic', or it would raise an exception. This option wasn't used in
the makefile.

Signed-off-by: Dylan Baker <c26a678a04c601e0311b0d6006e67eee6ed19a8e@intel.com>
Acked-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler