Fix compilation on newer compilers

[Tobias-Fischer]

src/native/counters.cc:26:6: error: variable or field '__sanitizer_cov_8bit_counters_init' declared void
   26 | void __sanitizer_cov_8bit_counters_init(uint8_t* start, uint8_t* stop);
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/native/counters.cc:26:41: error: 'uint8_t' was not declared in this scope
   26 | void __sanitizer_cov_8bit_counters_init(uint8_t* start, uint8_t* stop);
      |                                         ^~~~~~~
src/native/counters.cc:24:1: note: 'uint8_t' is defined in header '<cstdint>'; did you forget to '#include <cstdint>'?
   23 | #include "macros.h"
  +++ |+#include <cstdint>

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[Tobias-Fischer]

Signed

[bollwyvl]

I think the changes may go deeper for OSX, as seen on: https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=1016883&view=logs&jobId=9c5ef928-2cd6-52e5-dbe6-9d173a7d951b&j=9c5ef928-2cd6-52e5-dbe6-9d173a7d951b&t=20c71c51-4b27-578b-485d-06ade2de1d00