MacFUSE 4 removes support for passing device fd to the mount command. Adds support for the receiving the fd over a socket instead, and updates command paths and filesystem name.

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>

MacPorts installs osxfuse under /opt/local.

read(3) sometimes errors with EINTR on macOS over slow connections. 9pfuse(1) now retries read(3) instead of sysfatal(3)ing.

Change-Id: Ibca68261016b0f588e169e9f319748b5ba7d15ac Reviewed-on: https://plan9port-review.googlesource.com/2700 Reviewed-by: michaelian ennis <michaelian.ennis@gmail.com> Reviewed-by: Russ Cox <rsc@swtch.com>

R=rsc http://codereview.appspot.com/6503093

FUSE makes a reply write fail if the reply is no longer wanted.