Revert "cmd/coordinator: make version.sh return dirty if no git remotes"
Revert "cmd/coordinator: make version.sh return dirty if no git remotes"

This reverts CL 159699 (commit 269e03abe74bc43b688741a36205f5ca91dffce6)

Reason for revert: I now get failures:

bradfitz@gdev:~/src/golang.org/x/build/cmd/coordinator$ ./version.sh
./version.sh: 12: [: missing ]
a377ef91745ef6c4602d363321b0ee7e4a8be5a1-bradfitz-2019-01-30T19:45:32Z

Change-Id: I9e28ac41df327c29628f2b7ac3e0dd20cd31a921
Reviewed-on: https://go-review.googlesource.com/c/160480
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

golang/build,golang/build,golang/build,golang/build