Include <sys/systm.h> directly instead of relying on hidden UVM includes.

The header is being pulled via db_machdep.h -> uvm_extern.h -> uvm_map.h

fairly simple sizes for free()

Move grab/release of the kernel_lock for softintrs from the ASM stubs to
softintr_dispatch(). Delete traces of long superseded stats code.

ok beck@ mpi@ uebayasi@

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

For consistency, make sure that all archs that use the same pattern
always increment uvmexp.softs while inside the lock.

While i'm here, make alpha's dispatch loop look like the rest.

"sure" miod@

Switch the softinterrupt code on x86 over to mutexes instead of
simplelocks + splhigh().

First part of making it possible to make mpsafe softinterrupts.

"oh yes, definitely" miod@

First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code t

First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code that NetBSD has claimed for itself without attributing to the
actual authors.

OK deraadt@

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Move i386 to __HAVE_GENERIC_SOFT_INTERRUPTS

ok dlg@, tested by dlg@, oga@, jsg@, deraadt@