Various warnings building OQS Provider on Mac

[ashman-p]

I am hitting various complier warnings building oqs-provider on my Mac. I have a patch file that addresses these warnings. If worthwhile I can create a PR for this.

A sample of them includes.... cmake -S . -B _build && cmake --build _build && ctest --test-dir _build && cmake --install _build

• CMake Deprecation Warning at CMakeLists.txt:4 (cmake_minimum_required):

  Compatibility with CMake < 3.5 will be removed from a future version of CMake.

  Update the VERSION argument value or use a ... suffix to tell CMake that the project does not need compatibility with older versions.

• oqsprov/oqs_sig.c:221:5: warning: initializing 'const unsigned char *' with an expression of type 'char[27]' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]

  "060B6086480186FA6B50080101", // mldsa44_pss2048 [-Wpointer-sign]

• oqsprov/oqs_sig.c:485:62: warning: passing 'char ' to parameter of type 'const uint8_t ' (aka 'const unsigned char *') converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign]

          if (OQS_SIG_sign(oqs_key, buf, &oqs_sig_len, final_tbs,

• oqsprov/oqs_kem.c:241:18: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]

  if ((evp_ctx == NULL)) {

oqs_prov_warnings_fix.patch

[baentsch]

Thanks for this report @ashman-p . Of course, a PR is always welcome. Best would be if it came with CI demonstrating the fix (fails before, passes afterwards), making (CI of) the project more robust.