message: demo: Use QueryPerformanceCounter to measure performance on Windows
  As far as I can tell there is no way to get QPC/QPF via CRT these days
  short of possibly using std::chrono; to avoid including a giant
  windows.h we just declare QPC/QPF ourselves and call them.
diff: #include "miniz.h"
  #include "objparser.h"
  -#ifdef __linux__
  +#if defined(__linux__)
  double timestamp()
  {
  timespec ts;
  clock_gettime(CLOCK_MONOTONIC, &ts);
  return double(ts.tv_sec) + 1e-9 * double(ts.tv_nsec);
  }
  +#elif defined(_WIN32)
  +struct LARGE_INTEGER { __int64 QuadPart; };
  +extern "C" __declspec(dllimport) int __stdcall QueryPerformanceCounter(LARGE_INTEGER* lpPerformanceCount);
  +extern "C" __declspec(dllimport) int __stdcall QueryPerformanceFrequency(LARGE_INTEGER* lpFrequency);
  +
  +double timestamp()
  +{
  + LARGE_INTEGER freq, counter;
  + QueryPerformanceFrequency(&freq);
  + QueryPerformanceCounter(&counter);
  + return double(counter.QuadPart) / double(freq.QuadPart);
  +}
  #else
  double timestamp()
  {
  