Add tests for the above.
Add the fortify implementations of __stpcpy_chk and __stpncpy_chk.
Modify the strncpy test to cover more cases and use this template for
stpncpy.
Add all of the fortify test cases.
Bug: 13746695
Change-Id: I8c0f0d4991a878b8e8734fff12c8b73b07fdd344
Also undo some of the mess where we have OpenBSD <stdio.h> but a mix of
different BSD's implementations.
In this first pass, I've only moved easy OpenBSD stuff.
Change-Id: Iae67b02cde6dba9d8d06fedeb53efbfdac0a8cf6
