Change RTEMS GCC Thread model to POSIX, take 2

[Chris Johns]

Hi all,

This is an updated patch I have tested with the the latest RTEMS kernel 
with the pthread_once patch.

This change removes the weak support and RTEMS requires linking with 
POSIX enabled if C++ used.

I am going to commit this to the rtems-tools and update the RSB to use it.

Chris
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