[master] 30dc7dd Fix typo

[Tollef Fog Heen]

commit 30dc7dd090df8ca8f14c534e6f042fe1d987f4a2
Author: Tollef Fog Heen <tfheen at varnish-software.com>
Date:   Mon Mar 14 13:39:57 2011 +0100

    Fix typo

diff --git a/configure.ac b/configure.ac
index b954106..9849783 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,7 +24,7 @@ if test "x$ac_cv_prog_cc_c99" = "xno" || test "x$ac_cv_prog_cc_c99" = "x"; then
 # We might be on RHEL5 with a git checkout and so broken
 # autoconf. Check if CC is gcc and if it bails when given -std=gnu99.
 # If not, use that.  Yuck.
-  if test "x$ac_cv_c_compiler_gnu" = "yes"; then
+  if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
      CC="$CC -std=gnu99"
      AC_RUN_IFELSE(
 	[AC_LANG_PROGRAM([],[[