[rtems] Tweaks to sys/features.h

[Ralf Corsepius]

Hi again,

another RTEMS specific newlib patch, we'd like to see merged into
newlib.

This patch address 2 issue with sys/features.h:
* POSIX/SUSv3 mandates _POSIX_MONOTONIC_CLOCK to be set to -1, 0 or
200112L. RTEMS supports _POSIX_MONOTONIC_CLOCK but doesn't support
sysconf(), so it must be set 200112L.

* RTEMS doesn't support _POSIX_SHARED_MEMORY_OBJECTS. The setting having
been used so far was wrong.

Ralf

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