complibs/ppl: fix build with newer gcc

ppl-0.10.x does not build with gcc-4.6+, as it uses constructs that were
warnings with gcc-4.5 and before, but are now errors with gcc-4.6 and
above.

Fix that by passing -fpermissive in CFLAGS for ppl 0.10.

Reported-by: Jeremy Rosen <jeremy.rosen@openwide.fr>
Reported-by: Peter Korsgaard <jacmet@uclibc.org>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

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