Restore mistakenly deleted AM_CONDITIONAL

This commit was SVN r698.

config/lam_configure_options.m4

@@ -133,6 +133,7 @@ else
 fi
 AC_DEFINE_UNQUOTED(LAM_ENABLE_MPI_PROFILING, $WANT_MPI_PROFILE,
     [Do we want MPI profiling or not?])
+AM_CONDITIONAL(WANT_MPI_PROFILING, test "$WANT_MPI_PROFILE" = 1)
 
 
 #