cmake: XercesIntTypes: Add a <cstdint> functional check
cmake: XercesIntTypes: Add a <cstdint> functional check

Header presence isn't always sufficient; if the headers is
present but the compiler is in C++98 mode it will error out.


git-svn-id: 3ec853389310512053d525963cab269c063bb453@1798747 13f79535-47bb-0310-9956-ffa450edef68

colorer/xerces-c,ctapmex/xerces-c,colorer/xerces-c,ctapmex/xerces-c,ctapmex/xerces-c,ctapmex/xerces-c,colorer/xerces-c,colorer/xerces-c,colorer/xerces-c