Move localtime_r.c to the right directory.
Add putenv/unsetenv, which are subtly required.
Add gettimeofday and getrusage
Get time right (this is only the 90,000th time I've said this, though)
Correct some symbol exports.
machine_to_virtual: loop on the index variables, not the function input.
Handle signals correctly -- particularly unmasking -- and get the blocking system working.