linker segfaults after PR ld/15146 fix

[Sandra Loosemore]

After this commit

http://sourceware.org/ml/binutils-cvs/2013-02/msg00128.html

I'm now seeing segfaults in plugin_notice while doing testing of (our 
local branch of) GCC 4.7 on arm-none-eabi....  basically all LTO tests 
are falling over.

Looks like it needs a null check on h->u.undef.abfd before dereferencing 
it, consistently with the change in the same patch to bfd/elflink.c.  WDYT?

-Sandra



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