make: unifdef SUN5_0 (defined)

@@ -75,19 +75,17 @@
         (((a).tv_sec < (b).tv_sec) || (((a).tv_sec == file_doesnt_exist.tv_sec) && ((b).tv_sec == file_doesnt_exist.tv_sec)))
 
 #define SETVAR(name, value, append) \
                                 setvar_daemon(name, value, append, no_daemon, \
                                               true, debug_level)
-#ifdef SUN5_0
 #define MAX(a,b)                (((a)>(b))?(a):(b))
 /*
  * New feature added to SUN5_0 make,  invoke the vanilla svr4 make when
  * the USE_SVR4_MAKE environment variable is set.
  */
 #define SVR4_MAKE               "/usr/ccs/lib/svr4.make"
 #define USE_SVR4_MAKE           "USE_SVR4_MAKE"
-#endif
 /*
  * The standard MAXHOSTNAMELEN is 64. We want 32.
  */
 #define MAX_HOSTNAMELEN         32