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="Ioannis E. VENETIS"

 reporter_url="http://sourceware.org/ml/crossgcc/2009-11/msg00109.html"

 reporter_comment=""