[PATCH] Make cygwin use .gdbinit

[DJ Delorie]

I suggest something like:

  These files are normally named @file{.gdbinit} although filesystem
  limitations require that they be named @file{gdb.ini} on some
  platforms, such as DJGPP.

Although DJGPP also could look for .gdbinit first, then gdb.ini.  It
will work on LFN-enabled systems.  But the complaint about gdb.ini
would have to be silenced for DJGPP.

Also, there's no reason not to look for first .gdbinit and then
gdb.ini on *all* platforms, and warn the user only if *both* are
found.

PS: While DJGPP is indeed dos-based, most people don't realize it uses
the DOS simulator within Windows.  So a technically true statement can
still be misleading.  In the long war against MS trying to kill DOS,
we run into this kind of problem all the time.