Revert the recent Win command changes, will hopefully fix the bot

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1827 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Added kasan symbolizer script

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1828 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Drop the -Xclang flag once again

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1829 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5