kill-old-processes and delete-stale-build-files use CRLF linebreaks
https://bugs.webkit.org/show_bug.cgi?id=106622

Reviewed by Simon Fraser.

Use LF instead of CRLF in kill-old-processes and delete-stale-build-files.
Also escape clang\+\+ correctly in kill-old-processes.

* BuildSlaveSupport/delete-stale-build-files:
* BuildSlaveSupport/kill-old-processes:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139407 268f45cc-cd09-0410-ab3c-d52691b4dbfc