Terminal email address recognition patch

[Nick Schermer]

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

Greets,
Nick