Get rid of wordexp on serenity
Make fiber a noop
Serenity doesn't have ucontext.
Make coroutines a noop
Serenity doesn't have ucontext.
Don't mess with libsocket
Disable inject
tcc requires ucontext.
Disable openmp
Disable GC on serenity
Don't use libbsd on serenity
arc4random exists on serenity, there's no need to pull libbsd in for functionality that already exists.
Disable boehm GC on serenity
Serenity doesn't have a bdwgc port, so disable it here.