examples/bot/bot.pro: define TARGET to avoid warnings in Qt5
QtDockTile/Win: fix to build with Qt5
IrcSession: fix SSL connections

It turns out that some servers require the certificate to be requested.
QSslSocket::QueryPeer does that, but the certificate still doesn't need
to be valid. Furthermore, QSslSocket::startClientEncryption() must be
delayed until the connection is established.

Conflicts:
	src/ircsession.cpp
pkg.pri: check QT_CONFIG for no-pkg-config