Get the libssh2 version at runtime if possible #7768
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Previously this code used a compile time constant, meaning that libcurl always reported the libssh2 version that libcurl was built with. This could differ from the libssh2 version actually being used. The new code uses the CURL_LIBSSH2_VERSION macro, which is defined in ssh.h. The macro calls the libssh2_version function if it is available, otherwise it falls back to the compile time version.
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Previously this code used a compile time constant, meaning that libcurl always reported the libssh2 version that libcurl was built with. This could differ from the libssh2 version being used at runtime. The new code uses the
CURL_LIBSSH2_VERSIONmacro, which is defined in ssh.h. The macro calls thelibssh2_versionfunction if it is available, otherwise it falls back to the compile time version.