[amtk/meson-msvc: 19/22] amtk/meson.build: Fix exporting from enumeration sources

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

commit 01e8f23c4580f4636b50713d2ec7b01e3f1b85d7
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri May 8 14:05:08 2020 +0800

    amtk/meson.build: Fix exporting from enumeration sources
    
    Make sure we decorate the symbols in the header with_AMTK_EXTERN, and we
    include the needed header for it.

 amtk/meson.build | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/amtk/meson.build b/amtk/meson.build
index 585938c..d7f114e 100644
--- a/amtk/meson.build
+++ b/amtk/meson.build
@@ -30,7 +30,12 @@ amtk_sources = files(
   'amtk-utils.c',
 )
 
-amtk_enums = gnome.mkenums_simple('amtk-enum-types', sources : amtk_public_headers)
+amtk_enums = gnome.mkenums_simple(
+  'amtk-enum-types',
+  decorator: '_AMTK_EXTERN',
+  header_prefix: '#include <amtk/amtk-types.h>',
+  sources : amtk_public_headers
+)
 
 amtk_conf = configuration_data()
 amtk_conf.set_quoted('GETTEXT_PACKAGE', 'amtk-5')