wpp: Check for overflows when parsing integer constants. (try 2)

[Rob Shearman]

---
 libs/wpp/ppl.l |   39 ++++++++++++++++++++++++++++++++++++---
 1 files changed, 36 insertions(+), 3 deletions(-)

Not using nasty define hacks to bring make LLONG_MIN, LLONG_MAX and
ULLONG_MAX be defined with glibc this time - thanks to Alexandre.
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