configure.ac: Quote `$ac_cv_search_clock_gettime' properly.

This can expand to `none required', which confuses test(1).  My fault.

diff --git a/configure.ac b/configure.ac
index 3c8cb37529f8f64dc2de16bc418760fa5804c48a..902d7d59c063534e8e0418a196d84b42cbccbf23 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -227,7 +227,7 @@ AC_CHECK_HEADERS([linux/random.h])
 mdw_ORIG_LIBS=$LIBS LIBS=$CATACOMB_LIBS
 AC_SEARCH_LIBS([clock_gettime], [rt])
 CATACOMB_LIBS=$LIBS LIBS=$mdw_ORIG_LIBS
-if test $ac_cv_search_clock_gettime != no; then
+if test "$ac_cv_search_clock_gettime" != no; then
   AC_DEFINE([HAVE_CLOCK_GETTIME], [1],
            [Define if you have the \`clock_gettime' function.])
 fi