make: unifdef SUN5_0 (defined)

@@ -88,13 +88,11 @@
 Name            dollarless_value;
 Envvar          envvar;
 #ifdef lint
 char            **environ;
 #endif
-#ifdef SUN5_0
 int             exit_status;
-#endif
 wchar_t         *file_being_read;
 /* Variable gnu_style=true if env. var. SUN_MAKE_COMPAT_MODE=GNU (RFE 4866328) */
 Boolean         gnu_style = false;
 Name_set        hashtab;
 Name            host_arch;