[gnome-builder] clang: fix property type flags

[Christian Hergert <chergert src gnome org>]

commit 6c9ca7f499a5b91c3df41ebb17ab6162ec5c7db1
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jan 13 04:48:18 2018 -0800

    clang: fix property type flags

 src/plugins/clang/ide-clang-code-index-entries.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/plugins/clang/ide-clang-code-index-entries.c 
b/src/plugins/clang/ide-clang-code-index-entries.c
index 3a586796a..cfbbfbcd5 100644
--- a/src/plugins/clang/ide-clang-code-index-entries.c
+++ b/src/plugins/clang/ide-clang-code-index-entries.c
@@ -398,13 +398,13 @@ ide_clang_code_index_entries_class_init (IdeClangCodeIndexEntriesClass *klass)
     g_param_spec_pointer ("main-file",
                           "Main File",
                           "Name of file from which TU is parsed.",
-                          (G_PARAM_CONSTRUCT | G_PARAM_READWRITE));
+                          G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
 
   properties [PROP_UNIT] =
     g_param_spec_pointer ("unit",
                           "Unit",
                           "Translation Unit from which index entries are to be generated",
-                          (G_PARAM_CONSTRUCT | G_PARAM_READWRITE));
+                          G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
 
   g_object_class_install_properties (object_class, N_PROPS, properties);
 }