[PATCH] Add AT_SYSINFO_EHDR only support

[Roland McGrath]

I've put in similar changes.  There is nothing related to a pthreads
implementation in the fact that Linux/PowerPC wants to see a vDSO.
Please try the current cvs and put your dl-sysdep.h file in 
sysdeps/unix/sysv/linux/powerpc/dl-sysdep.h directly, and test that this works.

I am considering just putting in a sysdeps/unix/sysv/linux/dl-sysdep.h that
sets NEED_DL_SYSINFO_DSO, since any Linux platform might come to use
AT_SYSINFO_EHDR and if any kernel starts using it for signal trampoline
code, then we need to have that unwind info available.



Thanks,
Roland