Minor cosmetic changes to clean up some lint.
KNF
(waiting for a test kernel to compile...)
PROG26 version of __with_interrupts_disabled(), and hence of the various
functions in this file.
Honour ATOMIC_SET_BIT_NONINLINE_REQUIRED, now that it can be unset on
acorn26.
An incredibly grody hack to save a few more precious bytes: in dhclient,
don't include the unknown-{nn,mm} strings ifdef SMALL.
regenerate everything with fixed c++ math bits.
insert .WAIT between libcom_err and libasn1.
mention that eeprom can now actually change firmware settings on arm and
powerpc
Treate MAKEDEV.subr just as we treat MAKEDEV when creating ramdisk
images or miniroot images.
When creating /dev in a memory file system, include all three of
MAKEDEV, MAKEDEV.subr and MAKEDEV.local in the set of files that are
copied if they exist.

Now booting an INSTALL kernel with an embedded ramdisk correctly creates
/dev again, fixing a problem introduced when MAKEDEV.subr was created a
few days ago.
If MAKEDEV.subr is updated, remember to run MAKEDEV later.
Convert the guts of do_makedev() into a loop that checks both MAKEDEV
and MAKEDEV.subr.
Invent MAKEDEVSUBR and add it to IMAGEDEPENDS and PARSELISTENV if
appropriate.  Previously, IMAGEDEPENDS did not include MAKEDEV.subr.
${DESTDIR}/dev/MAKEDEV.subr -> ${MAKEDEVSUBR}
Add MAKEDEV.subr to IMAGEDEPENDS.  These miniroot images should probably
be converted to use common/Makefile.makedev.
simplify previous a bit.  no functional change.
check_pa_acc: don't bother to use KAUTH_MACHDEP_UNMANAGEDMEM
if the address is known.
no functional changes, unless listeners do some kind of logging.
sync with the code. (pri_t)
mention priority inheritance.
Fix a couple of races with LWP park/unpark.