[shotwell/shotwell-0.30] Fix accessibility issues with initializer of constants

[Jens Georg <jensgeorg src gnome org>]

commit f58dcf3101f9ce01cd641a55f3b4b16ad36d076c
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Nov 30 15:09:17 2021 +0100

    Fix accessibility issues with initializer of constants

 src/International.vala |  2 --
 src/Resources.vala     |  7 -------
 vapi/version.vapi      | 17 ++++++++++++++---
 3 files changed, 14 insertions(+), 12 deletions(-)
---
diff --git a/src/International.vala b/src/International.vala
index 555a91f8..73f07639 100644
--- a/src/International.vala
+++ b/src/International.vala
@@ -4,8 +4,6 @@
  * See the COPYING file in this distribution.
  */
 
-extern const string _LANG_SUPPORT_DIR;
-
 public const string TRANSLATABLE = "translatable";
 
 namespace InternationalSupport {
diff --git a/src/Resources.vala b/src/Resources.vala
index 9aa3992f..f9fa8753 100644
--- a/src/Resources.vala
+++ b/src/Resources.vala
@@ -4,13 +4,6 @@
  * See the COPYING file in this distribution.
  */
 
-// defined by ./configure or Makefile and included by gcc -D
-extern const string _PREFIX;
-extern const string _VERSION;
-extern const string GETTEXT_PACKAGE;
-extern const string _LIB;
-extern const string _LIBEXECDIR;
-
 namespace Resources {
     public const string APP_TITLE = "Shotwell";
     public const string APP_LIBRARY_ROLE = _("Photo Manager");
diff --git a/vapi/version.vapi b/vapi/version.vapi
index 06974c84..e191f2f7 100644
--- a/vapi/version.vapi
+++ b/vapi/version.vapi
@@ -1,3 +1,14 @@
-[CCode (cheader_filename="version.h")]
-extern const string? _GIT_VERSION;
-
+[CCode (cheader_filename = "version.h")]
+public const string? _GIT_VERSION;
+[CCode (cheader_filename = "config.h")]
+public const string _PREFIX;
+[CCode (cheader_filename = "config.h")]
+public const string _VERSION;
+[CCode (cheader_filename = "config.h")]
+public const string GETTEXT_PACKAGE;
+[CCode (cheader_filename = "config.h")]
+public const string _LIB;
+[CCode (cheader_filename = "config.h")]
+public const string _LIBEXECDIR;
+[CCode (cheader_filename = "config.h")]
+public const string _LANG_SUPPORT_DIR;