For now, disable using -fsanitize=bounds for the libc ssp tests, when
using clang 3.5.0, until the runtime support (via compiler-rt) is added.
Otherwise, this would lead to link errors about missing support
libraries.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274978 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f