[PATCH] Support for sysconf(_SC_MONOTONIC_CLOCK)

[Peter Kjellerstedt]

The attached patch adds support for sysconf(_SC_MONOTONIC_CLOCK).
This is required to get glib 0.12.3 to use the monotonic clock 
for its gtimers rather than gettimeofday().

I can commit the patch myself, but I would like an ok to do so
first. The reason is that I need to use a syscall to check whether
the monotonic clock support is actually present in the kernel,
and this is done in libc/unistd/sysconf.c. 

If this patch is not acceptable, then I guess we need to do 
something similar to what is done in glibc where this is done 
via a sysconf() which is in sysdeps/unix/sysv/linux/sysconf.c,
which in turn includes sysdeps/posix/sysconf.c.

Comments?

//Peter
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