[PATCH] Allow undefined symbols in shared library by default

[Rafael Ávila de Espíndola]

Fine by me, but someone from the lld side should LGTM it

>From the discussion on the list, there seem to be two consistent ways to handle this

- Say that a .so's dependency is the job of the dynamic linker (this patch new default and what gold does) (this is by far my preference).
- Fully implement what a dynamic linker does. In particular, resolve a symbol from a executable to an indirect dependency.  This is *not* done by gold or bfd ld.


http://reviews.llvm.org/D8901

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