Support spaces after @whatever@ in testlist

It makes testlist.in files more flexible and easier to read
Signed-off-by: Sangmin Seo <sseo@anl.gov>

maint/f77tof90.in

@@ -472,7 +472,7 @@ sub ConvertTestlist {
 	    # Cray-style pointers for MPI_Alloc_mem).
 	    $_ = "\@ALLOCMEMFC\@\n";
 	}
-	elsif (/^(\@\w+\@)(\w+f)\s+(.*)/) {
+	elsif (/^(\@\w+\@)(\s*\w+f)\s+(.*)/) {
 	    # This handles the case where an autoconf variable in the
             # testlist.in file is used to optionally comment out a test
 	    $_ = $1 . $2 . "90 "  . $3 . "\n";