meson: Fix Clang microsoft-enum-value detection.

Fixes: 3aee4627

 ("meson: add windows compiler checks and libraries")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
Part-of: <!7543>
(cherry picked from commit bb46a010)

.pick_status.json

@@ -301,7 +301,7 @@
         "description": "meson: Fix Clang microsoft-enum-value detection.",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": "3aee462781abc0bfcce207fb64f9199b43a57542"
     },

meson.build

@@ -992,10 +992,6 @@ if cc.get_id() == 'msvc'
       cpp_args += a
     endif
   endforeach
-  if cc.has_argument('-Wmicrosoft-enum-value')  # Clang
-    c_args += '-Wno-microsoft-enum-value'
-    cpp_args += '-Wno-microsoft-enum-value'
-  endif
 else
   _trial = [
     '-Werror=implicit-function-declaration',
@@ -1064,6 +1060,11 @@ else
       cpp_msvc_compat_args += a
     endif
   endforeach
+
+  if cc.has_argument('-Wmicrosoft-enum-value')  # Clang
+    c_args += '-Wno-microsoft-enum-value'
+    cpp_args += '-Wno-microsoft-enum-value'
+  endif
 endif
 
 # set linker arguments