Fixed CORE-4478: Failure to load provider/plugin not reported

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59822 65644016-39b1-43b1-bf79-96bc8fe82c15
rename constants used by extract.epp to avoid future naming conflicts

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59823 65644016-39b1-43b1-bf79-96bc8fe82c15