[RFA] Patch to imported readline to allow DJGPP build

[Michael Elizabeth Chastain]

Eli Zaretskii writes:
eli> Btw, I don't understand what is going on with Readline: I looked at
eli> its official home page (to figure out how to submit the patches below
eli> to the Readline maintainer) and found there an old version 4.3 of
eli> Readline where the DJGPP-specific code is ripped out.  The version
eli> that we have in the GDB repository seems a newer one, but it also has
eli> the DJGPP-specific code in it.  Can someone please tell me what is the
eli> story behind this?  TIA

Our readline has some changes since the last import, which was
2002-12-06 by Elena Z.  Check ChangeLog.gdb in the readline directory.
But I don't see any mention of "add djgpp code" in ChangeLog.gdb so
I am baffled too.

Michael C