#23 givens() fails

[D.A. Bright]

While testing the changes I made to book-latex.ll last
night, I found that the givens() function appears to be
broken. Although name(indi) will return, e.g., "Miriam
Chivers", givens(indi) will return "" (in the example,
it should be "Miriam"). This produces a less than
satisfactory output with running book-latex.ll. :-(

I didn't have much
time to investigate, but the implicit conversion
between STRING and unsigned char * that occurs during a
loop in givens (which I think was recently introduced)
left me wondering.

[D.A. Bright]

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Fixed by revision 1.18 of stdlib/stdstrng.c