CPUInfo: Add mingw helper for CalculateNumberOfCPUs

External/FEXCore/Source/Utils/CPUInfo.cpp

@@ -4,9 +4,14 @@
 
 #include <cstddef>
 #include <cstdint>
+#ifdef _WIN32
+#include <thread>
+#else
 #include <linux/limits.h>
+#endif
 
 namespace FEXCore::CPUInfo {
+#ifndef _WIN32
   uint32_t CalculateNumberOfCPUs() {
     char Tmp[PATH_MAX];
     size_t CPUs = 1;
@@ -21,4 +26,10 @@ namespace FEXCore::CPUInfo {
 
     return CPUs;
   }
+#else
+  uint32_t CalculateNumberOfCPUs() {
+    // May not return correct number of cores if some are parked.
+    return std::thread::hardware_concurrency();
+  }
+#endif
 }