[PATCH] Fix build failure when passing --with-builderstring.

[Cyril Brulebois <kibi@debian.org>]

If --with-builderstring="foo" is passed to configure (and sna enabled):
  CC     sna_driver.lo
src/sna/sna_driver.c: In function 'sna_init_scrn':
src/sna/sna_driver.c:1023:7: error: token ""foo"" is not valid in preprocessor expressions

Fix the missing defined() around the BUILDER_DESCRIPTION variable.

Signed-off-by: Cyril Brulebois <kibi@debian.org>
---
 src/sna/sna_driver.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/sna/sna_driver.c b/src/sna/sna_driver.c
index 83abdb3..767cd2c 100644
--- a/src/sna/sna_driver.c
+++ b/src/sna/sna_driver.c
@@ -1020,7 +1020,7 @@ void sna_init_scrn(ScrnInfoPtr scrn, int entity_num)
 #if defined(USE_GIT_DESCRIBE)
 	xf86DrvMsg(scrn->scrnIndex, X_INFO,
 		   "SNA compiled from %s\n", git_version);
-#elif BUILDER_DESCRIPTION
+#elif defined(BUILDER_DESCRIPTION)
 	xf86DrvMsg(scrn->scrnIndex, X_INFO,
 		   "SNA compiled: %s\n", BUILDER_DESCRIPTION);
 #endif
-- 
1.7.7.1