Fixed a typo which prevented the usage of the metis library when ./co…

…nfigure --with-METIS=DIR is used.

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@19957 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

configure.in

@@ -906,7 +906,7 @@ AC_ARG_WITH(PATOH, [  --with-PATOH=DIR                 Compile with PATOH hyperg
     AC_MSG_RESULT([Enabling PATOH... PATOHHOME="$withval"]);
 	PATOHHOME="$withval";
 ], [
-    if test USE_METIS=0; then
+    if test "$USE_METIS" =0; then
         USE_GRAPH=0
     fi
     USE_PATOH=0;