check for dbus before add erc-notify hook. #2681
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Emcs for OSX doesn't have dbus support by default. 'erc-global-notify makes a call to
notifications which seems to rely on dbus. Check to see if
dbus-compiled-version exists before adding hook.
Note: This variable is added in emacs 24.3. There may be a better way to
check for dbus support.
See #2324