HostFS example
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This example is available on leon-elf, leon3-elf, arm-elf, p55-elf and
ppc-elf.

1) Compiling the example.

   To compile, simply invoke gprbuild:

   gprbuild -p --target=<target> -Phostfs_example.gpr
            --RTS=ravenscar-full-<target> -XGNATEMU_BOARD=<board_name>

   for example:

   gprbuild -p --target=leon3-elf -Phostfs_example.gpr
            --RTS=ravenscar-full-leon3 -XGNATEMU_BOARD=leon3-elf

2) Running the example.
   <target>-gnatemu obj/main
