Consistently use min and max macros from lisp.h.

Consistently use min and max macros from lisp.h.
* coding.c (min, max):
* font.c (MAX):
* unexhp9k800.c (min):
* unexw32.c (min, max): Use definitions from lisp.h.
* regex.c (MAX, MIN) [!emacs]: Define own max and min as such.
Adjust users.
* gmalloc.c (min): Tiny style change.