Fix compile error with MINGW-64 GCC-12.1.0

[mcordova1967]

This change should fix a compile error that happens when using GCC v12.1.0 on Windows x64 (MINGW-64 via MSYS2):

../src/httplib.h: In constructor 'httplib::detail::gzip_decompressor::gzip_decompressor()':
../src/httplib.h:3064:8: error: 'memset' is not a member of 'std'; did you mean 'wmemset'?
3064 | std::memset(&strm_, 0, sizeof(strm_));
| ^~~~~~
| wmemset

The header ´´ should be included for Windows too.

[yhirose]

@mcordova1967, thanks for your contribution!

[mcordova1967]

Thank you! I can't believe I was able to do my first GIT commit, the article link you passed to me was vital, but there were some additional challenges ahead not mentioned in the article, like personal token, PGP keys, git commit using token, etc.

…

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[yhirose]

Glad to hear you enjoyed making your first pull request, and it was successful!