Compiling plotutils on RHL 9 fails

[Jos Vos]

> > g_write.cc:43: invalid conversion from `const unsigned char*' to `const cha
r*'
> 
> It's missing an explicit cast here.
> 
> Application bug.

Thanks, I didn't look carefully enough at the error message to see
it was thatg simple...  I patched it at 7 places or so and now I
have compiled it.

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--    Jos Vos <jos at xos.nl>
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