[xslt] detection of isinf, isnan and other math functions

Hello All,

I review recent changes done by Stefan Kost into configure script I note that isinf and isnan are to detected properly.

Functions isinf and isnan are definitions not real functions, so correct macro has to be :
AC_CHECK_DECLS([isinf, isnan], [], [], [[#include <math.h>]])

As ouher side I could not found where code use HAVE_ISNAN, HAVE_ISINF, HAVE_POW, HAVE_FLOOR and HAVE_FABS are used.
May be good patch is to remove all those checks.


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