As Nadav found out, we don't have to call defineClass and register each visible
Java class within the js scope, this makes it much simpler to integrate with Java
from the cli.

Currently, if we're requested to preempt while preemption is disabled, we
just ignore the request and wait until the next interrupt (which is not even
guaranteed to arrive) hits us.  This isn't the best arrangement.

Fix by latching the preemption request into a 'need_reschedule' thread local
variable, and examining it during preempt_enable().

Use includes from musl and external/, avoiding the host development
environment.

Not provided by the musl headers, and also unneeded.

We already get most of this from <sys/param.h>

This way we make sure any headers with the same name in the Solaris porting
glue get used first.  Also make sure the jni header is available to C code
as well.

libc: include/api
boost: external/misc.bin

bsd sources now prefer bsd's sys/ to our sys/, should be reconciled somehow
later.

Probably unneeded with the prototype fix, but can't hurt.

musl provides those, so use their definitions.

Not provided by musl, so mark as extern "C".

add extern "C" where needed, fix up prototypes.

musl doesn't provide these defines, and it isn't really necessary to put them
in some header.

include/glibc-compat defines headers that munge the musl headers (by including
other headers or defining some symbols) and using #include_next.

Eventually it should go away, but for now it reduces churn.

musl doesn't provide it.

With __musl's definition, the compile fails.  It isn't justified anyway.

We got some from musl, remove it from our list.

Need to get __BEGIN_DECLS from somewhere.

SIOCSIFNAME (which is named after the BSD creator's daughter, incidentally).

Add missing symbols to make bsd happy.

Missing timezone type.

confused with bsd's

Use glibc-compatible structure, not musl's.

Add missing __BEGIN_DECLS etc.