configure: Use single square brackets (POSIX)

Avoid "if [[...]]" format which seems to be bash extension.
The script uses "if [...]" except for this one.

Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/configure b/configure
index 03275787c4d074b808bec2cd47f85337d68aa970..9ac97017394b6dc19d1b06c6457a3dba6c89a00b 100755 (executable)
--- a/configure
+++ b/configure
@@ -1682,7 +1682,7 @@ int main(int argc, char **argv)
 EOF
 if compile_prog "" "" "s390_z196_facilities"; then
   $TMPE
-  if [[ $? -eq 0 ]]; then
+  if [ $? -eq 0 ]; then
        s390_z196_facilities="yes"
   fi
 fi