[gtk/master-msvc-fixes: 12/12] meson: Improve search for libpng

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

commit dbd0ce30d9ec4ad0baf958087bd3ff31e1f33957
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Sep 30 16:17:48 2021 +0800

    meson: Improve search for libpng
    
    On Visual Studio-style builds, it is likely that we do not have pkg-config
    files for libpng, so improve the search for libpng by using CMake's built-in
    mechanisms for looking for libpng.  This, however, means that we need to use
    'png' rather than 'libpng' for the package name to search for.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e85daf88f5..dd6e9d6471 100644
--- a/meson.build
+++ b/meson.build
@@ -400,7 +400,7 @@ pangocairo_dep = dependency('pangocairo', version: pango_req,
 pixbuf_dep     = dependency('gdk-pixbuf-2.0', version: gdk_pixbuf_req,
                             fallback : ['gdk-pixbuf', 'gdkpixbuf_dep'],
                             default_options: ['png=enabled', 'jpeg=enabled', 'builtin_loaders=png,jpeg', 
'man=false'])
-png_dep        = dependency('libpng',
+png_dep        = dependency(cc.get_argument_syntax() == 'msvc' ? 'png' : 'libpng',
                             fallback: ['libpng', 'libpng_dep'],
                             required: true)
 tiff_dep       = dependency('libtiff-4',