[PATCH] Implement _dl_catch_error, _dl_signal_error in libc.so [BZ #16628]

[Florian Weimer]

The attached patch depends on the elf/dl-load.c clean I posted today, 
and the addition of the __sigsetjmp hidden definitions on architectures 
which lack them.

The removal of the two function pointers from libc.so (the one in 
rtld_global, and the receiver pointer internal to elf/dl-error.c) is 
desirable from a security perspective, too.

Thanks,
Florian
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