Fix compile.py's path to the distcc hosts file.
Fix compile.py's path to the distcc hosts file.

Also use socket.getfqdn() to get the system's
full hostname.  Update the Mac codepath to also use
socket.getfqdn().

BUG=none
TEST=linux bots with distcc use that for their compile

Review URL: http://codereview.chromium.org/6087007

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@70481 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build