[atkmm] Text: Avoid the new-style deprecation warning.

[Murray Cumming <murrayc src gnome org>]

commit d2b24df310519326c6c6e71b5dfc69efc97e48f6
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Mar 24 19:49:21 2015 +0100

    Text: Avoid the new-style deprecation warning.

 atk/src/text.hg |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/atk/src/text.hg b/atk/src/text.hg
index d51e113..69ce06c 100644
--- a/atk/src/text.hg
+++ b/atk/src/text.hg
@@ -21,6 +21,7 @@ _DEFS(atkmm,atk)
 
 #m4 _PUSH(SECTION_CC_PRE_INCLUDES)
 #undef ATK_DISABLE_DEPRECATED
+#define ATK_DISABLE_DEPRECATION_WARNINGS 1
 #m4 _POP()
 
 #include <atkmm/component.h> /* for Atk::CoordType */