PR misc/46937: add modules package, from Lloyd Parkes.

Build ubsec module only for i386 and amd64 and punt on the other arches.

Build ubsec(4) as a module on all arches where it was obivous how to do so.
That excludes powerpc because evppc OEA is missing definitions for
PPC_INTR_IMPL and PPC_PCI_MACHDEP_IMPL.
Adjust set lists

Build ubsec(4) as a module on all arches where it was obivous how to do so.
That excludes powerpc because evppc OEA is missing definitions for
PPC_INTR_IMPL and PPC_PCI_MACHDEP_IMPL.
Adjust set lists.

Compile tested for most arches only.

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Build and install sljit.kmod and bpfjit.kmod iff ${MKSLJIT} != "no".

Enable bpfjit on sparc.

Create a modules.tgz set and move kernel modules into it.