[rfa] create testsuite/gdb.cp directory

[Michael Elizabeth Chastain <mec@shout.net>]

This is a formal proposal to create a new directory, testsuite/gdb.cp,
for c++ tests.  This proposal is for HEAD only, not gdb_6_0-branch.

The issue is that "gdb.c++" contains characters which are not permitted
on MS-DOS filenames.  So *every* file in testsuite/gdb.c++ must have an
entry in config/djgpp/fnchange.lst.  I would like to get away from that
requirement and use plain directory names that just work everywhere.

I propose to use testsuite/gdb.cp for new C++ test scripts only.
Existing scripts would remain in gdb.c++.

'cp' is the same name that other C++ files in gdb have,
such as cp-abi.c, cp-namespace.c, and cp-support.c.
Also libiberty/cp-demangle.c.

I am proposing this because I want to add a test script for
pr gdb/186, which has been open for two years and is still broken
with gdb HEAD.  I'd like to start adding new test scripts to
the new directory, so I'm coming here to create the new directory.

'cvs add' with a directory name is irreversible (with cvs commands
at least) so I am making a formal application to do this.

Okay to create new directory gdb/testsuite/gdb.cp in HEAD ?

Michael C