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Support WelsQueryLogicalProcessInfo for Fuchsia

Fuchsia, a new operating system (https://fuchsia.googlesource.com),
does not support the BSD sysctl call for querying the number of
processors in the system but does support the POSIX sysconf call.

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

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

@@ -46,9 +46,11 @@

 #include <sched.h>

 #elif !defined(_WIN32) && !defined(__CYGWIN__)

 #include <sys/types.h>

-#include <sys/sysctl.h>

 #include <sys/param.h>

 #include <unistd.h>

+#ifndef __Fuchsia__

+#include <sys/sysctl.h>

+#endif

 #ifdef __APPLE__

 #define HW_NCPU_NAME "hw.logicalcpu"

 #else

@@ -536,6 +538,10 @@

   pInfo->ProcessorCount = 1;

   return WELS_THREAD_ERROR_OK;

+#elif defined(__Fuchsia__)

+

+  pInfo->ProcessorCount = sysconf(_SC_NPROCESSORS_ONLN);

+  return WELS_THREAD_ERROR_OK;

 #else

   size_t len = sizeof (pInfo->ProcessorCount);