[DistCode] Tweaks to make distcc compile when using Xcode Build & Run.
Squashed 'distcc/' changes from 0a706a3..50966ac

50966ac [distcc] Readme formatting.
c71fa46 [distcc] Add an extended readme outlining the extra changes & provide a default makefile that should work.

git-subtree-dir: distcc
git-subtree-split: 50966ac9c8376085de0809f2ab017422f1a9a9ef
Merge latest distcc ref: 'af0595cdb67e68c643db90c81b752afc603394ae'
Squashed 'dmucs/' changes from d3462af..d01f4d4

d01f4d4 [dmucs] Readme for github.

git-subtree-dir: dmucs
git-subtree-split: d01f4d44ec7c6841b7ffbd329d36e705d72768c1
Merge latest dmucs ref: '5407eec142400bb1d2acacdea4fbb93d9117c4c0'