MFC r345499:
Change all kernel C-type macros into static inline functions.

The current kernel C-type macros might obscurely hide the fact that
the input argument might be used multiple times.

This breaks code like:
isalpha(*ptr++)

Use static inline functions instead of macros to fix this.

Reviewed by: kib @
Differential Revision: https://reviews.freebsd.org/D19694
Sponsored by: Mellanox Technologies

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core

Resolve conflicts arising from the ACPI CA 20021118 import.

Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot). This is consistant with the other
BSD's who made this change quite some time ago. More commits to come.

Move isfoo() and friends to the newly created sys/ctype.h.

Urged by: bde