[xml] unresolved .fpclassify under AIX

[Wolfram Nücker <wolfn web de>]

hello, 
I have trouble building libxml-2.4.25 under AIX. 
Problem is unresolved symbol .fpclassify from trionan.c.
The line "#elif defined(FP_PLUS_NORM) || defined(__hpux)" assumes you get fpclassify with FP_PLUS_NORM, but 
the  following comment only relates to HPUX, so better use && instead of || ?
AIX seems to have related function for fpclassify as "class" (or "_class" for C++ ;-)

regards
Wolfram Nücker
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