Don't use thin archives on OpenBSD 
Don't use thin archives on OpenBSD 

OpenBSD's binutils doesn't support thin archives. The make generator 
backend already knows to avoid using alink_thin on OpenBSD, so make 
the same change to the ninja generator now that ninja supports 
OpenBSD. 

BUG=
Review URL: https://codereview.chromium.org/14913004/

Patch from mdempsky@google.com!



git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1629 78cadc50-ecff-11dd-a971-7dbc132099af

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