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get_cpu_count: quiet -Wshorten-64-to-32 warnings

sysconf returns a long; cast (unsigned) dwNumberOfProcessors to int for
good measure

Change-Id: I1f181d7bd9a060c0898db41f66a5065394afdc4e

--- a/vp8/common/generic/systemdependent.c

+++ b/vp8/common/generic/systemdependent.c

@@ -37,9 +37,9 @@

 #if HAVE_UNISTD_H && !defined(__OS2__)

 #if defined(_SC_NPROCESSORS_ONLN)

-  core_count = sysconf(_SC_NPROCESSORS_ONLN);

+  core_count = (int)sysconf(_SC_NPROCESSORS_ONLN);

 #elif defined(_SC_NPROC_ONLN)

-  core_count = sysconf(_SC_NPROC_ONLN);

+  core_count = (int)sysconf(_SC_NPROC_ONLN);

 #endif

 #elif defined(_WIN32)

   {

@@ -61,7 +61,7 @@

       GetSystemInfo(&sysinfo);

 #endif

-    core_count = sysinfo.dwNumberOfProcessors;

+    core_count = (int)sysinfo.dwNumberOfProcessors;

   }

 #elif defined(__OS2__)

   {