Patch ping

[DJ Delorie]

> - http://gcc.gnu.org/ml/gcc-patches/2014-03/msg01370.html
>   PR sanitizer/56781
>   fix --with-build-config=bootstrap-ubsan bootstrap of lto-plugin

I have no particular problem with this patch, although the build has
gotten beyond my full understanding these days...

However, does this fix a regression?  If not, it should wait for
stage1.

> - http://gcc.gnu.org/ml/gcc-patches/2014-03/msg01433.html
>   PR sanitizer/56781
>   fix --with-build-config=bootstrap-asan bootstrap of lto-plugin

Are we really going to multilib libiberty for every "useful" option we
think of?  For the build/host, we have a generic way of providing
CFLAGS, and for the target we already have a multilib structure.