Fixed shell conditional in setup of IF_DLOPEN_TEST.

ChangeLog

 2015-12-18  Niels Möller  <nisse@lysator.liu.se>
 
+	* configure.ac (IF_DLOPEN_TEST): Fixed shell conditional.
+
 	* testsuite/ecc-mod-test.c (test_main): Handle random seeding if
 	NETTLE_TEST_SEED is set in the environment.
 

configure.ac

@@ -827,7 +827,7 @@ IF_DLOPEN_TEST='#'
 if test "x$enable_shared" = xyes ; then
   IF_SHARED=''
   IF_NOT_SHARED='#'
-  if "x$ac_cv_lib_dl_dlopen" = yes ; then
+  if test "x$ac_cv_lib_dl_dlopen" = xyes ; then
     IF_DLOPEN_TEST=''
   fi
 else