make: unifdef SUN5_0 (defined)

*** 162,174 ****
                                 catgets(catd, 1, 156, "Current working directory %s\n"),
                                 get_current_path());
          }
          (void) fflush(stderr);
          if (fatal_in_progress) {
- #if defined(SUN5_0) || defined(HP_UX) || defined(linux)
                  exit_status = 1;
- #endif
                  exit(1);
          }
          fatal_in_progress = true;
  #ifdef TEAMWARE_MAKE_CMN
          /* Let all parallel children finish */
--- 162,172 ----
*** 198,210 ****
  
  #if defined (TEAMWARE_MAKE_CMN) && defined (MAXJOBS_ADJUST_RFE4694000)
          job_adjust_fini();
  #endif
  
- #if defined(SUN5_0) || defined(HP_UX) || defined(linux)
          exit_status = 1;
- #endif
          exit(1);
  }
  
  /*
   *      warning(format, args...)
--- 196,206 ----
*** 288,302 ****
  {
          char                    pwd[(MAXPATHLEN * MB_LEN_MAX)];
          static char             *current_path;
  
          if (current_path == NULL) {
- #if defined(SUN5_0) || defined(HP_UX) || defined(linux)
                  getcwd(pwd, sizeof(pwd));
- #else
-                 (void) getwd(pwd);
- #endif
                  if (pwd[0] == (int) nul_char) {
                          pwd[0] = (int) slash_char;
                          pwd[1] = (int) nul_char;
  #ifdef DISTRIBUTED
                          current_path = strdup(pwd);
--- 284,294 ----
*** 732,750 ****
  
          /* Set the value of $(SHELL) */
          #ifdef HP_UX
          MBSTOWCS(wcs_buffer, NOCATGETS("/bin/posix/sh"));
          #else
-         #if defined(SUN5_0)
          if (posix) {
            MBSTOWCS(wcs_buffer, NOCATGETS("/usr/xpg4/bin/sh"));
          } else {
            MBSTOWCS(wcs_buffer, NOCATGETS("/bin/sh"));
          }
-         #else  /* ^SUN5_0 */
-         MBSTOWCS(wcs_buffer, NOCATGETS("/bin/sh"));
-         #endif /* ^SUN5_0 */
          #endif
          (void) SETVAR(shell_name, GETNAME(wcs_buffer, FIND_LENGTH), false);
  
          /*
           * Use " FORCE" to simulate a FRC dependency for :: type
--- 724,738 ----