ZeroMQ support for solo mining

Gets new blocks from daemon immediately without polling, saving ~0.5 seconds on average when daemon gets new block from the network. Also saves some CPU cycles because it doesn't need to poll daemon every second.

Testing: add "daemon-zmq-port": 28083 to xmrig's pool config in config.json and run ./monerod --testnet --zmq-pub tcp://127.0.0.1:28083

src/crypto/astrobwt/AstroBWT.cpp

@@ -30,6 +30,7 @@
 #include "crypto/astrobwt/AstroBWT.h"
 #include "backend/cpu/Cpu.h"
 #include "base/crypto/sha3.h"
+#include "base/tools/bswap_64.h"
 #include "crypto/cn/CryptoNight.h"
 
 
@@ -54,21 +55,6 @@ __attribute__((ms_abi))
 void SHA3_256_AVX2_ASM(const void* in, size_t inBytes, void* out);
 #endif
 
-#ifdef _MSC_VER
-
-#include <stdlib.h>
-#define bswap_64(x) _byteswap_uint64(x)
-
-#elif defined __GNUC__
-
-#define bswap_64(x) __builtin_bswap64(x)
-
-#else
-
-#include <byteswap.h>
-
-#endif
-
 #ifdef XMRIG_ARM
 extern "C" {
 #include "salsa20_ref/ecrypt-sync.h"