[folks] Add note for future cleaning when we require Vala 0.12

[Travis Reitter <treitter src gnome org>]

commit a9f240ab4f95a2786758c487e9b82fdbd31931d5
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Thu Feb 3 11:39:48 2011 -0800

    Add note for future cleaning when we require Vala 0.12

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f9c5f8a..37f91d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,6 +72,7 @@ AC_SUBST([FOLKS_MAJOR_MINOR_VERSION])
 
 GLIB_REQUIRED=2.24.0
 TP_GLIB_REQUIRED=0.13.1
+# XXX: once we bump this to 0.12.x, remove all the #if VALA_0_12 conditionals
 VALA_REQUIRED=0.10.0
 
 PKG_CHECK_MODULES([GLIB],