Switch to MEM_LIBC_MALLOC usage in lwIP. Added event callbacks. Use of finer-grained locks in RX logic. CRCs disabled on inbound packets

ext/ZeroTierOne.patch

@@ -0,0 +1,17 @@
+diff --git a/service/OneService.cpp b/service/OneService.cpp
+index a1c53764..757863a8 100644
+--- a/service/OneService.cpp
++++ b/service/OneService.cpp
+@@ -2244,6 +2244,12 @@ public:
+ #endif
+ 					syncManagedStuff(n,true,true);
+ 					n.tap->setMtu(nwc->mtu);
++#if defined(ZT_SDK)
++					// Inform the virtual tap of the update
++					if (op == ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_CONFIG_UPDATE) {
++						n.tap->lastConfigUpdate(OSUtils::now());
++					}
++#endif
+ 				} else {
+ 					_nets.erase(nwid);
+ 					return -999; // tap init failed

ext/lwip-contrib.patch

@@ -1,16 +1,33 @@
 diff --git a/ports/unix/port/include/arch/cc.h b/ports/unix/port/include/arch/cc.h
-index a3dac04..39fede7 100644
+index a3dac04..424285e 100644
 --- a/ports/unix/port/include/arch/cc.h
 +++ b/ports/unix/port/include/arch/cc.h
-@@ -34,7 +34,7 @@
+@@ -32,6 +32,8 @@
+ #ifndef LWIP_ARCH_CC_H
+ #define LWIP_ARCH_CC_H
  
++#include "include/Debug.hpp"
++
  /* see https://sourceforge.net/p/predef/wiki/OperatingSystems/ */
  #if defined __ANDROID__
--#define LWIP_UNIX_ANDROID
-+//#define LWIP_UNIX_ANDROID
- #elif defined __linux__
- #define LWIP_UNIX_LINUX
- #elif defined __APPLE__
+ #define LWIP_UNIX_ANDROID
+@@ -55,7 +57,7 @@
+ #endif
+ 
+ #if defined(LWIP_UNIX_ANDROID) && defined(FD_SET)
+-typedef __kernel_fd_set fd_set;
++//typedef __kernel_fd_set fd_set;
+ #endif
+ 
+ struct sio_status_s;
+@@ -63,4 +65,7 @@ typedef struct sio_status_s sio_status_t;
+ #define sio_fd_t sio_status_t*
+ #define __sio_fd_t_defined
+ 
++// Comment out the following line to use lwIP's default diagnostic printing routine
++#define LWIP_PLATFORM_DIAG(x)    do {DEBUG_INFO x;} while(0)
++
+ #endif /* LWIP_ARCH_CC_H */
 diff --git a/ports/win32/include/arch/cc.h b/ports/win32/include/arch/cc.h
 index 334be07..9384b70 100644
 --- a/ports/win32/include/arch/cc.h