The option should control the compilation, in wesnoth-core, of
filesystem_boost.cpp, and gettext_boost.cpp, vs. the old versions.
Using the new code is now the default option, you must explicitly
deactivate with both cmake and scons to get the old stuff back.
it seems like sometimes libintl.h is needed for LC_MESSAGES so we need
to move that last code that uses LV_MESSAGES out of language.cpp into
gettext.cpp
This includuces an alternative implementation of gettext.cpp. Libintl gettext doesn't seem to support utf8 filenames on windows. Also it causes problems when changign the language on my msvc build. That why i want to use boost locale gettext at least for our windows builds.
This requires boost locale which is introduced in boost 1.48 (That's why i still hesitate to make it the default on all systems).
