Use thread destructor function to free string buffer after thread completion

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60119 65644016-39b1-43b1-bf79-96bc8fe82c15
Remove obsolete header file.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60120 65644016-39b1-43b1-bf79-96bc8fe82c15
Misc.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60121 65644016-39b1-43b1-bf79-96bc8fe82c15
Really remove the file now :).

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60122 65644016-39b1-43b1-bf79-96bc8fe82c15