[gtk/gtk-3-24-meson] meson: statically link immodules under mingw by default

[Christoph Reiter <creiter src gnome org>]

commit 9b9a3313c3b47dc3de136c31673cec7b4a9b6836
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun Mar 31 19:12:08 2019 +0200

    meson: statically link immodules under mingw by default
    
    To match what the autotools build does right now.

 meson.build | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 2142509d2c..1e806e974d 100644
--- a/meson.build
+++ b/meson.build
@@ -615,8 +615,9 @@ builtin_modules_opt = get_option('builtin_immodules')
 builtin_immodules = []
 
 if builtin_modules_opt == ''
-  if cc.get_id() == 'msvc'
-  # Current MSVC projects build all immodules directly into GTK by default
+  if os_win32
+    # Current MSVC projects build all immodules directly into GTK by default,
+    # as does the mingw autotools build
     message('IMModules are built into GTK for MSVC builds by default')
     builtin_immodules = ['all']
   else