Port movemail to RHEL 6 with --enable-gcc-warnings

* lib-src/movemail.c (main): Declare local only if needed.

lib-src/movemail.c

@@ -174,8 +174,6 @@ main (int argc, char **argv)
   int desc;
 #endif /* not MAIL_USE_SYSTEM_LOCK */
 
-  char *spool_name = 0;
-
 #ifdef MAIL_USE_POP
   bool pop_reverse_order = false;
 # define ARGSTR "pr"
@@ -247,6 +245,10 @@ main (int argc, char **argv)
 
   char *lockname = 0;
 
+#ifdef MAIL_USE_MAILLOCK
+  char *spool_name = 0;
+#endif
+
 #ifndef MAIL_USE_SYSTEM_LOCK
 #ifdef MAIL_USE_MAILLOCK
   spool_name = mail_spool_name (inname);