[PATCH] erc: XEmacs make-obsolete only takes two arguments

Adrian Aichner writes:
 > +(if (featurep 'xemacs)
 > +    (make-obsolete 'erc-current-network 'erc-network)
 > +  (make-obsolete 'erc-current-network 'erc-network "Obsolete since erc-nets 1.5"))

This is better written as 

(condition-case nil
    (make-obsolete 'erc-current-network 'erc-network "Obsolete since erc-nets 1.5")
  (wrong-number-of-arguments (make-obsolete 'erc-current-network 'erc-network)))

This way if XEmacs syncs to the three arg version, the code will
automatically start using the extra arg.


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