Port recent inline functions fix to Standard C

Port recent inline functions fix to Standard C

* src/lisp.h (LISP_MACRO_DEFUN, LISP_MACRO_DEFUN_VOID): Remove.
All uses rewritten to define the function directly rather than to
use a macro to define the function.  This conforms to Standard C,
which does not allow stray semicolons at the top level.  I hope it
also avoids the problems with TAGS.  Those macros, though clever,
were pretty confusing anyway, and it wasn’t clear they were worth
the aggravation even without the TAGS problem.