Gcc 4 outputs a bunch of compiler warnings about string pointers that
differ in signedness.  The warnings in a zsh build are limited to the
zle string functions defined in zle.h.  I came up with 2 solutions:
(1) change the ZS_str* macros to cast their args to (char*), or (2)
introduce some static inline functions to handle the casts.  The
advantage of the latter is that it doesn't hide pointer-conversion
errors behind forced casts.  For instance, after I compiled the inline
version it showed several places in the code that were using ZWC() on
strings instead of ZWS() (which I already fixed and checked in).

As for the portability of "inline", there is an autoconf macro that I
included, AC_C_INLINE, that redefines the word "inline" as appropriate.
The rsync package used a static inline function in its rsync.h for many
years (thought I eliminated it recently), so it would seem to be quite
portable.

Comments?

..wayne..