Test compiler arguments for the appropriate compiler

MSVC does not expose GCC-compatible compiler arguments, so there's no
point in even trying.

meson.build

@@ -73,7 +73,8 @@ endif
 conf.set10('ENABLE_GLX', build_glx)
 
 # Compiler flags, taken from the Xorg macros
-test_cflags = [
+if cc.get_id() != 'msvc'
+  test_cflags = [
     '-Wpointer-arith',
     '-Wmissing-declarations',
     '-Wformat=2',
@@ -105,7 +106,11 @@ test_cflags = [
     '-Werror=pointer-to-int-cast',
     '-fno-strict-aliasing',
     '-Wno-int-conversion',
-]
+  ]
+else
+  test_cflags = []
+endif
+
 common_cflags = []
 foreach cflag: test_cflags
   if cc.has_argument(cflag)