Fix some prototypes in manpage synopses.
Reduce diffs between GENERIC/X86_64_GENERIC a bit.
kernel: Adjust some header comments. SMP is default now for a while.
porting_drivers.txt: Reword the part about SVN IDs a bit.
share/mk: Fix the creation of MLINKS for manpages of fschg'd stuff.

We cannot pass INSTALLFLAGS directly for manual page installation because
when INSTALLFLAGS contains -fschg (such as for init(8)), it will cause the
manual page to be fschg'd too which breaks subsequent MLINKS creation.

Therefore, use MANINSTALLFLAGS for manual pages. While here, document it
too.
GC a manpage backup that was created by passing -b when installing it.
kernel: Start removing syslink.

It's tied in with a few things that we don't want to break, so care is
needed.

Approved-by: dillon
Fix two prototypes in manual pages.
test: Test push
iicbb: Update from FreeBSD
kernel/x86_64: Display Standard Extended Features during CPU setup.

Taken-from: FreeBSD
Tested-by:  Mihai Carabas <mihai.carabas@gmail.com>, ftigeot
uipc: Set up netmsg's socket properly before perform notify abort

Mainly to make the netisr so_port change chasing work
drm2: remove DRM_SPINXXX macros

* They did not apply 1:1 to DragonFly locking directives; keeping them
  in the drivers would have meant lockmgr locks would have had to be be
  used in situations where spinlocks could have done the job.

* Besides the obvious performance pessimization issues, they had the
  unfortunate effect of obscuring the source code

* The original DRM code in the Linux kernel doesn't even use them, they
  were purely a FreeBSD addition
drm2: Remove dubious AGP locks

They are not present in the original Linux code.
kernel: Add bitcount32 to sys/systm.h
kernel: Import pci_save_state and pci_restore_state from FreeBSD
acpica: Replace some include paths by full ones

To allow the ACPI header files to be used in the whole kernel
acpica: Fix buildworld issue introduced by previous commit
sysctl_add_oid.9: Reduce diffs to Free a bit.
Merge branch 'master' into gsocdrm_alter