Moved from PerfAlgo to Algo in threads to removed not really used cn-fast threads setup

src/common/crypto/Algorithm.h

@@ -44,7 +44,7 @@ public:
         m_variant(VARIANT_AUTO)
     {}
 
-    inline Algorithm(Algo algo, Variant variant) :
+    inline Algorithm(Algo algo, Variant variant = VARIANT_AUTO) :
         m_variant(variant)
     {
         setAlgo(algo);

src/common/xmrig.h

@@ -34,7 +34,8 @@ enum Algo {
     INVALID_ALGO = -1,
     CRYPTONIGHT,       /* CryptoNight (Monero) */
     CRYPTONIGHT_LITE,  /* CryptoNight-Lite (AEON) */
-    CRYPTONIGHT_HEAVY  /* CryptoNight-Heavy (SUMO) */
+    CRYPTONIGHT_HEAVY, /* CryptoNight-Heavy (SUMO) */
+    ALGO_MAX
 };
 
 // algorithms that can has different performance