ORIGEN : use absolute paths and fix tool naming

On some hosts using relative paths will cause the build to fail. This
patch sets absolute paths for the tools directory

Get rid of MSDOS style excecutable extension

Signed-off-by: Angus Ainslie <angus.ainslie@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>