[libhandy] Add private headers

[Alexander Mikhaylenko <alexm src gnome org>]

commit e7c3e8fa00f6a68b2e0629db5ee115e641ea710e
Author: Mingli Yu <mingli yu windriver com>
Date:   Wed Dec 8 07:35:52 2021 +0000

    Add private headers
    
    After the commit(8157ecc Separate public and private enums) introduced,
    there comes a race as below:
     | In file included from ../git/src/hdy-settings.c:11:
     | ../git/src/hdy-settings-private.h:16:10: fatal error: hdy-enums-private.h: No such file or directory
     |    16 | #include "hdy-enums-private.h"
    
    So also add private headers like private sources to libhandy_sources to
    fix the issue.
    
    Signed-off-by: Mingli Yu <mingli yu windriver com>

 src/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/meson.build b/src/meson.build
index d0873237..6f11f27b 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -64,7 +64,7 @@ hdy_private_enums = gnome.mkenums('hdy-enums-private',
 )
 
 libhandy_public_sources += [hdy_public_enums[0]]
-libhandy_private_sources += [hdy_private_enums[0]]
+libhandy_private_sources += hdy_private_enums
 libhandy_generated_headers += [hdy_public_enums[1]]
 
 src_headers = [