fixed processing of LIBINT_SUPPORTS_* macros

Author: evaleev

configure.ac

@@ -390,7 +390,8 @@ AC_ARG_WITH(eri-opt-am,
 
 if test X$INCLUDE_ERI != Xno; then
   AC_DEFINE_UNQUOTED(INCLUDE_ERI,$INCLUDE_ERI)
-  AC_SUBST(LIBINT_SUPPORTS_ERI,"yes")
+  LIBINT_SUPPORTS_ERI=yes
+  AC_SUBST(LIBINT_SUPPORTS_ERI)
 fi
 
 ONEBODY_MAX_AM=$LIBINT_MAX_AM
@@ -442,7 +443,8 @@ AC_ARG_WITH(1body-opt-am,
 
 if test X$INCLUDE_ONEBODY != Xno; then
   AC_DEFINE_UNQUOTED(INCLUDE_ONEBODY,$INCLUDE_ONEBODY)
-  AC_SUBST(LIBINT_SUPPORTS_ONEBODY,"yes")
+  LIBINT_SUPPORTS_ONEBODY=yes
+  AC_SUBST(LIBINT_SUPPORTS_ONEBODY)
 fi
 
 # check max am for 3-center ERIs, if needed