[LWIP] Correctly synchronize to lwIP 1.4.1 (#6123)

* [TCPIP] Rename lwip library to lwipcore

* [TCPIP] Remove ReactOS-specific code from LWIP library

* [TCPIP] Synchronize LWIP code to 1.4.1

Update to LWIP 1.4.1 should have been done by bd3b0e8ef4
However, I was unable to find the exact revision used in this commit.

So, do the following
- take code from STABLE-1_4_1 commit on https://git.savannah.gnu.org/git/lwip.git
- cherry-pick LWIP 32aa9a41e2013e5ee6eee09317a848647e37badf (CORE-8978)
- cherry-pick LWIP c0b534e5318baf870e2152c70d4d11a3a86181f3
- add a ReactOS-specific change in src/api/tcpip.c (missing include)
- add ReactOS specific file CMakeLists.txt

NOTE: Changes are mostly in unit test files (not used) and CHANGELOG file.

CORE-7140

drivers/network/tcpip/include/lwip/arch/sys_arch.h

@@ -0,0 +1,39 @@
+/* ReactOS-Specific lwIP binding header - by Cameron Gutman */
+
+/* Implmentation specific structs */
+typedef struct _sys_sem_t
+{
+    KEVENT Event;
+    int Valid;
+} sys_sem_t;
+
+typedef struct _sys_mbox_t
+{
+    KSPIN_LOCK Lock;
+    LIST_ENTRY ListHead;
+    KEVENT Event;
+    int Valid;
+} sys_mbox_t;
+
+typedef KIRQL sys_prot_t;
+
+typedef u32_t sys_thread_t;
+
+typedef struct _LWIP_MESSAGE_CONTAINER
+{
+    PVOID Message;
+    LIST_ENTRY ListEntry;
+} LWIP_MESSAGE_CONTAINER, *PLWIP_MESSAGE_CONTAINER;
+
+#define sys_jiffies() sys_now()
+
+/* NULL definitions */
+#define SYS_MBOX_NULL NULL
+#define SYS_SEM_NULL NULL
+#define SYS_ARCH_NULL NULL
+
+void
+sys_arch_protect(sys_prot_t *lev);
+
+void
+sys_arch_unprotect(sys_prot_t lev);