LibreSSL compatibility about luasec HOT 4 CLOSED

COMP_METHOD still exists in libressl: https://github.com/libressl-portable/openbsd/blob/master/src/lib/libssl/src/crypto/comp/comp.h

Maybe some extra header needs to be included?

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libressl has this typedef in include/openssl/comp.h; the sources compile with libressl if #include <openssl/comp.h> is added to ssl.c

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Compression support was removed from LibreSSL. The inclusion of <openssl/comp.h> from <openssl/ssl.h> was removed in the http://freshbsd.org/commit/openbsd/b13dbd20ab3f5c4544ee24eeb184ab912dd9808a?diff=lib%2Flibssl%2Fsrc%2Fssl%2Fssl.h change. On LibreSSL, meth_compression should just unconditonally return no compression is being used. (Or the interface could be removed?) LibreSSL unconditonally defines OPENSSL_NO_COMP to signal it has no compression support. You could use that macro to control whether the compression interfaces are used.

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Merged, thanks!

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