pebble-sdk: install docs to doc folder

Closes #29065.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
pebble-sdk 2.1.1

Closes #29402.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
pebble-sdk: update 2.1.1 bottle.
blacklist: remove gcc
blacklist: gfortran is now part of gcc
udptunnel 1.1 (new formula)

Added new formula for udptunnel. This tool tunnels UDP data over a TCP connection.
Home page at http://wiki.leipzig.freifunk.net/Udptunnel .
Addressed adamv@'s comments at https://github.com/Homebrew/homebrew/pull/29406 .
udptunnel: add 1.1 bottle.
pebble-sdk: update 2.1.1 bottle.