telnet: Handle integer overflow gracefully.

[Collin Funk]

I've pushed the attached patch removing an integer overflow from telnet.

The overflow occurs went sending 'send dont <value>' but the value
exceeds INT_MAX.

Also, I'm adding inttypes and xstrtoimax from Gnulib. Perhaps it is too
much personal opinion but I find error checking strtol and friends
annoying. I'd prefer using xstrtoimax, since it deals with all the
conditions and platform discrepancies. But feel free to change to a
standard function if you'd like.

Collin

0001-telnet-Handle-integer-overflow-gracefully.patch
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