[gtk: 1/3] Fix preprocessor conformance with MSVC

[Matthias Clasen <matthiasc src gnome org>]

commit 872e04f94eb61e213ad586072aee42e9b5ba38ed
Author: William Roy <wroy proton me>
Date:   Mon Sep 26 19:52:57 2022 +0000

    Fix preprocessor conformance with MSVC

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index 1f3ac591f3..035efb2422 100644
--- a/meson.build
+++ b/meson.build
@@ -256,6 +256,7 @@ if cc.get_id() == 'msvc'
     '-FImsvc_recommended_pragmas.h',
        '-D_USE_MATH_DEFINES',
        '-utf-8',
+  '-Zc:preprocessor'
   ]
   add_project_arguments(cc.get_supported_arguments(test_cflags), language: 'c')