[gnome-nibbles] build: Turn off srcdir != builddir

[Colin Walters <walters src gnome org>]

commit 779d85d8a20b11d58f0f896c313763e0902f3f85
Author: Colin Walters <walters verbum org>
Date:   Sun Oct 25 21:24:57 2015 -0400

    build: Turn off srcdir != builddir
    
    It's broken right now at least in GContinuous, and it's easier to just
    turn it off for something this small than debug it.

 configure.ac |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 46b2722..66b2757 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,6 +5,10 @@ AM_INIT_AUTOMAKE([1.11 no-dist-gzip dist-xz foreign])
 AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE([enable])
 
+dnl srcdir != builddir from git is broken with vala, hitting
+dnl issues with valac --gresources.
+echo \#buildapi-variable-no-builddir >/dev/null
+
 AC_PROG_CC
 
 AM_PROG_VALAC([0.28.0])