make: unifdef SUN5_0 (defined)

*** 75,93 ****
          (((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
  
--- 75,91 ----