ntdll: Set a better exit status when the main image fails to load.

dlls/ntdll/env.c

@@ -513,7 +513,7 @@ done:
 
 failed:
     MESSAGE( "wine: cannot find %s\n", debugstr_w(name) );
-    RtlExitUserProcess( GetLastError() );
+    RtlExitUserProcess( STATUS_DLL_NOT_FOUND );
 }