Terminal email address recognition patch

[Benedikt Meurer]

Nick Schermer wrote:
> After commit 22240 i get the following warnings when starting the terminal:
> 
> ** (terminal:27523): WARNING **: Error compiling regular expression
> "\<(mailto:)?[a-z0-9][a-z0-9.-+]*@[a-z0-9][a-z0-9-]*(\.[a-z0-9][a-z0-9-]*)+\>".
> 
> ** (terminal:27523): CRITICAL **: vte_terminal_match_set_cursor:
> assertion `tag < terminal->pvt->match_regexes->len' failed

I reverted the patch for now. Feel free to come up with a portable fix.

> Greets,
> Nick

Benedikt