make: unifdef for SUNOS4_AND_AFTER (defined)

*** 56,70 ****
  void
  depvar_add_to_list(Name name, Boolean cmdline)
  {
          Depvar          dv;
  
- #ifdef SUNOS4_AND_AFTER
          dv = ALLOC(Depvar);
- #else
-         dv = (Depvar) Malloc(sizeof(struct _Depvar));
- #endif
          dv->name = name;
          dv->next = NULL;
          dv->cmdline = cmdline;
          *bpatch = dv;
          bpatch = &dv->next;
--- 56,66 ----
*** 85,99 ****
          Depvar          dv;
  
          for (dv = depvar_list; dv != NULL; dv = dv->next) {
                  if (name == dv->name) {
  #ifdef NSE
- #ifdef SUNOS4_AND_AFTER
                          if (dv->cmdline) {
- #else
-                         if (is_true(dv->cmdline)) {
- #endif
                                  nse_dep_cmdmacro(dv->name->string);
                          }
  #endif
                          variant_deps = true;
                          break;
--- 81,91 ----
*** 112,126 ****
  {
          Depvar          dv;
  
          for (dv = depvar_list; dv != NULL; dv = dv->next) {
                  if (name == dv->name) {
- #ifdef SUNOS4_AND_AFTER
                          if (dv->cmdline) {
- #else
-                         if (is_true(dv->cmdline)) {
- #endif
                                  nse_rule_cmdmacro(dv->name->string);
                          }
                          break;
                  }
          }
--- 104,114 ----