make: unifdef SUN5_0 (defined)

@@ -162,13 +162,11 @@
                                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 */

@@ -198,13 +196,11 @@
 
 #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...)

@@ -288,15 +284,11 @@
 {
         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);

@@ -732,19 +724,15 @@
 
         /* 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