Fix build error with NDK r27

[Galasnow]

Enable policy CMP0057 for cmake version >= 3.3. Fix Issue #5592

[tencent-adm]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.93%. Comparing base (391152f) to head (a8a4538).

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5615       +/-   ##
===========================================
- Coverage   94.73%   89.93%    -4.80%     
===========================================
  Files         786      263      -523     
  Lines      248546    77166   -171380     
===========================================
- Hits       235462    69403   -166059     
+ Misses      13084     7763     -5321     

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[Galasnow]

For Android X86 ABI, manually turning off avx512 by -DNCNN_AVX512=OFF can pass the compilation. It's a problem beyond my capability QAQ, I will report an issue in NDK repository.

[nihui]

Thanks for your contribution !

[nihui]

For Android X86 ABI, manually turning off avx512 by -DNCNN_AVX512=OFF can pass the compilation. It's a problem beyond my capability QAQ, I will report an issue in NDK repository.

maybe -DNCNN_AVX512BF16=OFF is enough, so we still gain most avx512 optimizations in ncnn

[Galasnow]

maybe -DNCNN_AVX512BF16=OFF is enough, so we still gain most avx512 optimizations in ncnn

Build pass on Windows. Thanks! I learned a lot.