msvcrt: Don't set _EM_AMBIGOUS flag in _control87 when sse2 is not supported.

Fixes compilation warning.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/msvcrt/math.c

@@ -5677,8 +5677,11 @@ unsigned int CDECL _control87(unsigned int newval, unsigned int mask)
 
     __control87_2( newval, mask, &flags, &sse2_cw );
 
+    if (sse2_supported)
+    {
         if ((flags ^ sse2_cw) & (_MCW_EM | _MCW_RC)) flags |= _EM_AMBIGUOUS;
         flags |= sse2_cw;
+    }
 #else
     flags = newval;
     _setfp(&flags, mask, NULL, 0);