Nice speedup of MAKEDEV on slower archs. ok fries@ deraadt@

ok deraadt@ brad@

known DoS attacks, like de-auth flooding against wireless networks.
an example is provided in the manual page.
"or could you just got for it?", deraadt@

"inspired" by deraadt@

fix inspired by and closes pr 4495
ok krw@

can be changed via sysctl's.
ok markus@

client; from amh@POBOX.COM

show how to disable it;
ok deraadt@

output goes to syslog and not console by moving around log_init
OK henning@, markus@ and mblamer@

spews1 the default.  OK deraadt@

From: Matthias Kilian <kili@outback.escape.de>

with a set skip statement to the same effect, performs way better
suggested by Stuart Henderson <stu@spacehopper.org>, theo ok

and EINTR, so do it, more or less from bgpd

From Solar Designer based on changes in FreeBSD.  OK deraadt@

From: Thomas Jarosch <thomas.jarosch@intra2net.com>

Kill old files that are no longer compiled.
okay theo

Make sure tolower/toupper use the whole 8 bits.
okay deraadt@
thanks to everyone who tested

relevant anyway;
ok jaredy@

- avoid first person.
ok jmc

okay deraadt@, millert@, krw@

from netbsd pr #30872 (anonymous post);
ok deraadt@ krw@