complibs/ppl: build watchdog library

gcc-4.6+ requires the Parma Watchdog Library (libpwl).
Build it and use it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

reporter_name="YEM"

reporter_url="http://ymorin.is-a-geek.org/"

reporter_comment="EXPERIMENTAL Super-H sh4 sample."