Fixed CORE-4058

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@57728 65644016-39b1-43b1-bf79-96bc8fe82c15
An ultimate solution for the CRT warnings targeted at both native and external (ICU, BTYACC) modules. Inspired by the ICU-only patch contributed by Dmitry Kovalenko.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@57730 65644016-39b1-43b1-bf79-96bc8fe82c15