Small syntactical change to make it compile under Borland's compiler.

It does not make it worse under other compilers, so why not. Basically
it was just changing ::iswspace() to iswspace(), i.e. get rid of the ::
prefix, which freaked out Borland for some reason.


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@171448 13f79535-47bb-0310-9956-ffa450edef68