buildbot:

factor out llvm checkout code
simple config for the bootstrap bot


git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1598 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Syntax fix.


git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1599 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
fix the way we include scripts


git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1600 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Add an empty  extra env for the bootstrap bot


git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1601 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Checkout libcxxabi


git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1602 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5