- ax_arg_openssl.m4: fixed broken LibreSSL/OpenSSL checking message
- Minimum supported OpenSSL version is 1.1.1 now
- ax_arg_openssl.m4: minimum supported OpenSSL version is 1.0.1f now
- Update ax_append_compile_flags.m4 and ax_arg_openssl.m4 from hybrid
- Added HTTPS support for SSL/TLS-enabled HTTP proxies
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