libm: Properly end some comments before starting a new one.
fsck(8): Raise WARNS to 2 and fix warnings.
ipfw(8): Raise WARNS to 2 and fix warnings.
Remove libxpg4 stub which never played a role for DragonFly.
kernel/i386: Remove some old devices from the userconfig list.
kernel: Fix a bunch of drm warnings.
kernel: Drop ISA support from most remaining drivers that had some.

After this commit we're only left with things like atkbd, sio, etc.
which have to stay.
LINT/LINT64: Additional adjustment for e19e3c77407.
kernel/i386: Make digi(4) compilable into the kernel and add it to LINT.