Add basic regression test for modf() issue.

encouraged by deraadt and miod
Split the 88100 floating point support code in two files, one for the precise
exceptions, one for the imprecise exceptions. No functional change.
Replace the unmaintainable assembler code responsible for 88100 precise FPU
fault handling with a C wrapper around the softfloat code, as already done for
88110 kernels.

As a bonus, attempting to read or write FPU control registers but fcr62 and
fcr63 in userland will now correctly signal an illegal instruction, instead
of leaving the destination register unchanged and pretending nothing bad
happened.

Be sure to rm m88100_fp.d in your kernel compile directory after updating your
tree.
update to 1.6.0 with official syslog support backported from the 1.7 branch

tested by several, ok sthen@
Add regress test for explicit_bzero.
Add regress tests for timingsafe_bcmp and timingsafe_memcmp.

timingsafe_memcmp tests are disabled for now, pending its addition to
libc.
Add timingsafe_memcmp().

ok deraadt, jmc, tedu
Add regress test for MAP_INHERIT_ZERO.
Add new getentropy() system call.  Code and pressure from matthew.
I accepted that he's right (again) to seperate this out from heavy
sysctl API and this will simply a variety of things.  Functionname
is not used by anyone in the ports tree, so we guess we can use it.
Shocking that no application has a function called this.
ok matthew & others who pushed him to start this early on