make: unifdef SUN5_0 (defined)

@@ -89,15 +89,11 @@
 enum {
         update_delay = 30,              /* time between rstat checks */
 #ifdef sun386
         ar_member_name_len = 14,
 #else
-#if defined(SUN5_0) || defined(linux)
         ar_member_name_len = 1024,
-#else
-        ar_member_name_len = 15,
-#endif
 #endif
 
         hashsize = 2048                 /* size of hash table */
 };
 

@@ -948,13 +944,11 @@
 extern Boolean          dollarget_seen;
 extern Boolean          dollarless_flag;
 extern Name             dollarless_value;
 extern char             **environ;
 extern Envvar           envvar;
-#if defined(SUN5_0) || defined(HP_UX) || defined(linux)
 extern int              exit_status;
-#endif
 extern wchar_t          *file_being_read;
 /* Variable gnu_style=true if env. var. SUN_MAKE_COMPAT_MODE=GNU (RFE 4866328) */
 extern Boolean          gnu_style;
 extern Name_set         hashtab;
 extern Name             host_arch;