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Only use CPU_COUNT if available

Fixes build error on Linux hosts with GLIBC < 2.6.

Resolves issue #2089

--- a/codec/common/src/WelsThreadLib.cpp

+++ b/codec/common/src/WelsThreadLib.cpp

@@ -476,10 +476,21 @@

   CPU_ZERO (&cpuset);

-  if (!sched_getaffinity (0, sizeof (cpuset), &cpuset))

+  if (!sched_getaffinity (0, sizeof (cpuset), &cpuset)) {

+#ifdef CPU_COUNT

     pInfo->ProcessorCount = CPU_COUNT (&cpuset);

-  else

+#else

+    int32_t count = 0;

+    for (int i = 0; i < CPU_SETSIZE; i++) {

+      if (CPU_ISSET(i, &cpuset)) {

+        count++;

+      }

+    }

+    pInfo->ProcessorCount = count;

+#endif

+  } else {

     pInfo->ProcessorCount = 1;

+  }

   return WELS_THREAD_ERROR_OK;