[geary/ricotz/vala: 3/5] Add missing includes for extern symbols

[Rico Tzschichholz <ricotz src gnome org>]

commit c8108600bada4749f7b48917c0d976aca3d08785
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Apr 27 08:44:23 2021 +0200

    Add missing includes for extern symbols

 src/engine/db/db.vala            | 1 +
 src/engine/util/util-string.vala | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/engine/db/db.vala b/src/engine/db/db.vala
index 438a1cd90..a79f4ae51 100644
--- a/src/engine/db/db.vala
+++ b/src/engine/db/db.vala
@@ -25,6 +25,7 @@
 // Work around missing const in sqlite3.vapi. See Bug 795627.
 extern const int SQLITE_OPEN_URI;
 
+[CCode (cheader_filename = "sqlite3.h")]
 extern int sqlite3_enable_shared_cache(int enabled);
 
 namespace Geary.Db {
diff --git a/src/engine/util/util-string.vala b/src/engine/util/util-string.vala
index 6b4cdfe22..f02363492 100644
--- a/src/engine/util/util-string.vala
+++ b/src/engine/util/util-string.vala
@@ -5,7 +5,7 @@
  */
 
 // GLib's character-based substring function.
-[CCode (cname = "g_utf8_substring")]
+[CCode (cheader_filename = "glib.h", cname = "g_utf8_substring")]
 extern string glib_substring(string str, long start_pos, long end_pos);
 
 namespace Geary.String {