Fixes #339.

Need to think a bit more about locking, but overall it's a working devdraw. Multiclient mode may not be working but nothing is using it yet.

Also turn mac-srv.c into a generic srv.c, so we can remove the duplication with x11-srv.c.

Remote whitespace at the ends of lines. Remove blank lines from the ends of files. Change modes on source files so that they are not executable. Signed-off-by: Dan Cross <cross@gajendra.net>

Should be a clean build now. Change-Id: Id3460371cb5e8d4071f8faa9c2aec870d213a067 Reviewed-on: https://plan9port-review.googlesource.com/2781 Reviewed-by: Russ Cox <rsc@swtch.com>

R=rsc http://codereview.appspot.com/6846104

Fixed at 100 right now, but the plan is to make it accurate and then use it. R=rsc http://codereview.appspot.com/6856091