meson: disable sse4.1 optimizations with msvc

There isn't an obvious command line switch here, /arch:AVX *might* be
the right thing, but meson doesn't know what to do here either and
leaves the -msse4.1 and -mstackrealign.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Acked-by: Kristian H. Kristensen <hoegsberg@google.com>

meson.build

@@ -1027,7 +1027,7 @@ if host_machine.system() == 'windows'
   endif
 endif
 
-if host_machine.cpu_family().startswith('x86')
+if host_machine.cpu_family().startswith('x86') and cc.get_id() != 'msvc'
   pre_args += '-DUSE_SSE41'
   with_sse41 = true
   sse41_args = ['-msse4.1']