Brace try/except in main() for Watcom

c/flmain.c

@@ -42,6 +42,7 @@ static value_t argv_list(int argc, char *argv[])
 int main(int argc, char *argv[])
 {
     fl_init(512 * 1024);
+    {
         FL_TRY_EXTERN
         {
             if (fl_load_boot_image())
@@ -57,5 +58,6 @@ int main(int argc, char *argv[])
             ios_putc('\n', ios_stderr);
             return 1;
         }
+    }
     return 0;
 }