Make the mkdir failure non-fatal

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1837 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Drop the extra .obj step (-c) when building non-DLL tests

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1838 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5