[PATCH] Add AT_SYSINFO_EHDR only support

[Steve Munroe]

This patch adds support for architectures that want to use VDSO as a 
library but don't need all the (Intel specific) syscall mechanism. 
Specifically for kernels that provide AT_SYSINFO_EHDR but not AT_SYSINFO.

The 1st patched defines the new macro NEED_DL_SYSINFO_EHDR and made the 
parts that implement function specific AT_SYSINFO_EHDR conditional on:

#if defined NEED_DL_SYSINFO || NEED_DL_SYSINFO_EHDR

This means platforms that currently use AT_SYSINFO don't change and 
platforms that only need AT_SYSINFO_EHDR can do so by defining only 
NEED_DL_SYSINFO_EHDR.

The 2nd patch adds VDSO (AT_SYSINFO_EHDR only) support for Powerpc 
Linuxthread.

The 3rd patch adds VDSO (AT_SYSINFO_EHDR only) support for Powerpc nptl.
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