message: fix google benchmark build for ANDROID SDK < 29
diff: #include <kstat.h>
  #endif
  +#if defined(__ANDROID__)
  +#include <android/api-level.h>
  +#endif
  +
  #include <algorithm>
  #include <array>
  #include <bitset>
  @@ -583,7 +587,11 @@ std::vector<double> GetLoadAvg() {
  defined BENCHMARK_OS_OPENBSD
  constexpr int kMaxSamples = 3;
  std::vector<double> res(kMaxSamples, 0.0);
  +#if defined(__ANDROID__) && (__ANDROID_API__ < 29)
  + const int nelem = 0;
  +#else
  const int nelem = getloadavg(res.data(), kMaxSamples);
  +#endif
  if (nelem < 1) {
  res.clear();
  } else {
  