BUILD: Pb of not defined fd in the init unix socket function on W build fixed (unix socket doesn't exist on W...)
- Some signals are not available on W - Add macros to convert to correct types for W
windows poll() signature
NOTE: Squash and small edits of Elliu's commits.
Now it is up to the user to select a correct UTF-8 locale. In lektor we only check if it is an UTF-8 locale, we don't set it (because en_US.UTF-8 or fr_FR.UTF-8 is not always available)
