If required_version is lower than or equal to the version number of the libssh2 in use, the version number of libssh2 is returned as a pointer to a zero terminated string.
The required_version should be the version number as constructed by the LIBSSH2_VERSION_NUM define in the libssh2.h public header file, which is a 24 bit number in the 0xMMmmpp format. MM for major, mm for minor and pp for patch number.
To make sure you run with the correct libssh2 version:
Unconditionally get the version number:
This function was added in libssh2 1.1, in previous versions there way no way to extract this info in run-time.
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