Remove dead code, useless #defines, et al

os/log.c

@@ -524,10 +524,8 @@ FatalError(const char *f, ...)
     VErrorF(f, args);
     va_end(args);
     ErrorF("\n");
-#ifdef DDXOSFATALERROR
     if (!beenhere)
 	OsVendorFatalError();
-#endif
     if (!beenhere) {
 	beenhere = TRUE;
 	AbortServer();

os/osinit.c

@@ -193,9 +193,7 @@ OsInit(void)
 	been_here = TRUE;
     }
     TimerInit();
-#ifdef DDXOSINIT
     OsVendorInit();
-#endif
     /*
      * No log file by default.  OsVendorInit() should call LogInit() with the
      * log file name if logging to a file is desired.