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Build successfully on OpenBSD (which lacks sysctlbyname(3))

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

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

@@ -504,7 +504,12 @@

   size_t len = sizeof (pInfo->ProcessorCount);

+#if defined(__OpenBSD__)

+  int scname[] = { CTL_HW, HW_NCPU };

+  if (sysctl (scname, 2, &pInfo->ProcessorCount, &len, NULL, 0) == -1)

+#else

   if (sysctlbyname (HW_NCPU_NAME, &pInfo->ProcessorCount, &len, NULL, 0) == -1)

+#endif

     pInfo->ProcessorCount = 1;

   return WELS_THREAD_ERROR_OK;