powerpc help needed: Defining hidden alias for __sigsetjmp

[Florian Weimer]

I'm trying to create a hidden alias for __sigsetjmp on powerpc.  The 
problem is that powerpc uses the generic <setjmp.h> wrapper, which has a 
libc_hidden_proto for it, but the implementation of that redirect never 
happens.

I came up with the attached patch.  It adds a definition of the hidden 
redirect to libc.so, as expected.  But in addition to that, I get this 
ABI difference on powerpc32:

-GLIBC_2.3.4 __longjmp F

This does not happen on powerpc64.

I really can't explain that.  Any ideas?

Florian
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