Mesa (master): configure: Fix bashism.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 9856d658ced3382060f4d805f3e4fbdc2b618e64
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9856d658ced3382060f4d805f3e4fbdc2b618e64

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Mar  4 14:43:16 2014 -0800

configure: Fix bashism.

/bin/sh defaults to dash on debian.

Reviewed-by: Brian Paul <brianp at vmware.com>

---

 configure.ac |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 258cb3d..3f75266 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1072,7 +1072,7 @@ if test -n "$with_dri_drivers"; then
 
     dri_drivers=`IFS=', '; echo $with_dri_drivers`
     for driver in $dri_drivers; do
-        DRI_DIRS+="$driver "
+        DRI_DIRS="$DRI_DIRS $driver"
         case "x$driver" in
         xi915)
             HAVE_I915_DRI=yes;