Add patches/15_tlsext_host_name

Add debian/patches/15_tlsext_host_name: Work around change in
libssl0.9.8 (0.9.8g-15+lenny9 and 0.9.8o-3), taken from 0.2.1.27
(closes: #604198):

Do not set the tlsext_host_name extension on server SSL objects; only on
client SSL objects.  We set it to immitate a browser, not a vhosting
server. This resolves an incompatibility with openssl 0.9.8p and openssl
1.0.0b.  Fixes bug 2204; bugfix on 0.2.1.1-alpha.