[glom] Add missing declaration

[Murray Cumming <murrayc src gnome org>]

commit 6af40b3a0b56062cd62b8e60f01eaa3fcb506f6a
Author: Murray Cumming <murrayc murrayc com>
Date:   Sun Jan 6 17:58:08 2013 +0100

    Add missing declaration

 tests/test_selfhosting_utils.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tests/test_selfhosting_utils.h b/tests/test_selfhosting_utils.h
index ab60f61..fc7ce07 100644
--- a/tests/test_selfhosting_utils.h
+++ b/tests/test_selfhosting_utils.h
@@ -94,5 +94,7 @@ typedef sigc::slot<bool, Glom::Document::HostingMode> SlotTest;
  */
 int test_all_hosting_modes(const SlotTest& slot);
 
+bool test_check_numeric_value_type(Glom::Document::HostingMode hosting_mode, const Gnome::Gda::Value& value);
+
 #endif //GLOM_TEST_SELFHOSTING_UTILS_H