Makefile: correctly handle version suffixes on macOS

[ZhongRuoyu]

On macOS, the version suffix of a shared library comes before the .dylib suffix, which is different from the convention on other systems. Currently, the Makefile only overrides DYLIB_MINOR_NAME for macOS, but does not handle the other similar variables, namely DYLIB_MAJOR_NAME, SSL_DYLIB_MINOR_NAME, and SSL_DYLIB_MAJOR_NAME.

This PR fixes the issue by overriding all these variables for macOS.