multimedia/libxine: fix linking against openssl

This fixes the build on DragonflyBSD (and likely openssl from ports):

[...]
tls/tls_openssl.c:183: error: undefined reference to 'ERR_get_error'
tls/tls_openssl.c:183: error: undefined reference to 'ERR_error_string'
tls/tls_openssl.c:199: error: undefined reference to 'ERR_get_error'
[...]

Reported by: tuxillo@quantumachine.net