#4 Port to EBCDIC mainframe

[Martin Kraemer]

On a machine with an EBCDIC character set, libedit will
not work unless
a) an ASCII environment exists which works "as if" all
characters were in ASCII, or
b) the ASCII-dependent functions are wrapped into
conversion macros to actually work on EBCDIC characters.

The attached patch solves the problem in the b) method
by wrapping ASCII-Code into from-ASCII and to-ASCII macros.

Thus libedit works even on a mainframe ;-)

The port was done for the BS2000 operating system. For
IBM machines, the wrapper macros have to be added by
someone with an IBM machine at hand.

[Martin Kraemer]

Port for libedit on hosts using an EBCDIC character set