Avoid loading <string> by ICU

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59659 65644016-39b1-43b1-bf79-96bc8fe82c15
Use GlobalPtr for static variable doing memory allocation

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59660 65644016-39b1-43b1-bf79-96bc8fe82c15