Add initial openocd/simulator test suite and GNU tool build script.

        * .gitignore: Added.
        * boards/README: Added.
        * boards/gdb-comm.exp: Add enhanced gdb-comm script.
        * boards/or1k-elf-openocd.exp: Add openocd board description.
        * boards/or1k-elf-sim.exp: Add or1k simulator board description.
        * boards/or32-linux-sim.exp: Add linux board description.
        * build-elf.sh: Add elf toolchain build script.
        * site-openocd.exp: Add openocd site file.
        * site-sim.exp: Add or1k-elf-run site file.