LibC: Add stubs that I have locally

I'm not sure if these are used by anything but I would assume so as I
have added them :D

functions added:
- getprotobyname
- open_memstream
- munlock
- lockf
- nice
- crypt
- getsid
- wcstoul

userspace/libraries/LibC/sys/mman.cpp

@@ -53,6 +53,11 @@ int mlock(const void*, size_t)
 	ASSERT_NOT_REACHED();
 }
 
+int munlock(const void*, size_t)
+{
+	ASSERT_NOT_REACHED();
+}
+
 int shm_open(const char* name, int oflag, mode_t mode)
 {
 	(void)name;