POSIX demo on QEMU LM3S6965 port.

A preliminary show case for POSIX demo running on QEMU LM3S6965 port.
Please see README.md in qemu_posix_LM3S6965 branch for instrunction. In case you do not have Keil MDK license, compiled images are attached for you to play with.

This is NOT official, nor the code is clean.