[gdk-pixbuf/msvc.improvements] Visual Studio builds: use -utf-8 if available

[Chun-wei Fan <fanchunwei src gnome org>]

commit be79999c3947860d76da7622e38d259082f50f86
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Feb 20 12:22:09 2020 +0800

    Visual Studio builds: use -utf-8 if available
    
    This avoids the build from erroring out due to warning/error C4819 (Unicode
    handling issue in the compiler), which is likely to occur on Chinese, Japanese
    and Korean locales

 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 6aebaed1d..411af6ec3 100644
--- a/meson.build
+++ b/meson.build
@@ -119,8 +119,8 @@ common_ldflags = []
 if cc.get_id() == 'msvc'
   # For Visual Studio, just force-include msvc_reommended_pragmas.h
   # so that we silence unwanted noise and track potential issues
-  test_cflags = []
-  add_project_arguments([ '-FImsvc_recommended_pragmas.h' ], language: 'c')
+  test_cflags = [ '-FImsvc_recommended_pragmas.h', '-utf-8' ]
+  add_project_arguments(cc.get_supported_arguments(test_cflags), language: 'c')
 elif cc.get_id() == 'gcc' or cc.get_id() == 'clang'
   test_cflags = [
     '-Wpointer-arith',