AstroBWT algorithm (DERO) support

To test:

- Download https://github.com/deroproject/derosuite/releases/tag/AstroBWT
- Run daemon with `--testnet` in command line

In config.json:
- "coin":"dero"
- "url":"127.0.0.1:30306"
- "daemon:"true"

src/backend/cpu/platform/HwlocCpuInfo.cpp

@@ -216,6 +216,12 @@ bool xmrig::HwlocCpuInfo::membind(hwloc_const_bitmap_t nodeset)
 
 xmrig::CpuThreads xmrig::HwlocCpuInfo::threads(const Algorithm &algorithm, uint32_t limit) const
 {
+#   ifdef XMRIG_ALGO_ASTROBWT
+    if (algorithm == Algorithm::ASTROBWT_DERO) {
+        return BasicCpuInfo::threads(algorithm, limit);
+    }
+#   endif
+
     if (L2() == 0 && L3() == 0) {
         return BasicCpuInfo::threads(algorithm, limit);
     }