[gnome-chess] Require Vala 0.26

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 15387228ded020a6b2c88f7ee036e1de82aa9982
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Dec 30 20:33:35 2014 -0600

    Require Vala 0.26
    
    For G_SOURCE_CONTINUE and G_SOURCE_REMOVE

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 17a249a..9e1a240 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@ AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE([enable])
 GNOME_MAINTAINER_MODE_DEFINES
 
-AM_PROG_VALAC([0.24])
+AM_PROG_VALAC([0.26])
 AM_PROG_CC_C_O
 
 LT_PREREQ([2.2])