[xml] trionan.c requires -mieee for gcc/alpha


I don't know why IEEE 754 floating point arithmetic is important for
libxml2, but trionan.c throws this error when compiled on Tru64 UNIX
5.1 running gcc-3.0.3:

/bin/sh ./libtool --mode=compile gcc -DHAVE_CONFIG_H -I. -I.. -I. -I../include -I./include     
-I/sw/common/include   -g -O2 -Wall -c ../xpath.c
rm -f .libs/xpath.lo
gcc -DHAVE_CONFIG_H -I. -I.. -I. -I../include -I./include -I/sw/common/include -g -O2 -Wall -c ../xpath.c  
-DPIC -o .libs/xpath.lo
In file included from ../xpath.c:89:
../trionan.c:105:4: #error "Must be compiled with option -mieee"

I guess it's easy enough to add -mieee to CFLAGS when building on this
platform, but couldn't it be configure's job somehow?


  David Starks-Browning                  | starksb ebi ac uk
  EMBL Outstation --                     |
  The European Bioinformatics Institute  |
  Wellcome Trust Genome Campus           | tel: +44 (1223) 494 616
  Hinxton, Cambridge, CB10 1SD, UK       | fax: +44 (1223) 494 468

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