pkg/53098: textproc/libxml2 does not compile on Solaris 11

[joern.clausen%uni-bielefeld.de@localhost]

>Number:         53098
>Category:       pkg
>Synopsis:       textproc/libxml2 does not compile on Solaris 11
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 14 09:30:00 +0000 2018
>Originator:     Joern Clausen
>Release:        
>Organization:
University of Bielefeld
>Environment:
>Description:
Compilation of textproc/libxml2 on Solaris 11.3 with GCC 4.9.4 fails with

  CC       xpath.lo
xpath.c:489:1: error: initializer element is not constant
 double xmlXPathPINF = INFINITY;
 ^
xpath.c:490:1: error: initializer element is not constant
 double xmlXPathNINF = -INFINITY;

>How-To-Repeat:

>Fix:
There is a definition for INFINITY in /usr/include/iso/math_c99.h, but it is guarded by

#if defined(_STDC_C99) || _XOPEN_SOURCE - 0 >= 600 || defined(__C99FEATURES__)