perldelta for 88e3936f.
Remove 4 redundant #undefs, missed by commit 79be8fb4ac8fa995.

That commit removed all the code that defined PERL_NEED_MY_HTOLE64,
PERL_NEED_MY_LETOH64, PERL_NEED_MY_HTOBE64 and PERL_NEED_MY_BETOH64, but
missed removing code in perl.h which conditionally undefined them.
Added is_core(), which returns true if the module was/is in core

Default to checking against $^V, but you can optionally specify
the perl release, and can also optionally specify a minimum
version of the module.

Signed-off-by: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
Remove Cwd from the "actually architecture dependant files" special cases.

This probably hasn't been needed since the file Cwd.pm was moved from lib/
into the directory containing its XS code.
Add a USING_MSVC6 macro to identify Microsoft Visual C++ 6.0

This simplifies some of the logic necessary for coping with its various
problems.

Suggested by Nicholas Clark.
perldelta - Un-TODO 9c7618be

As noted by Karl Williamson, it's very unlikely that any user would have
encountered the bug which this fixed, so it's not worth mentioning in
perldelta.
perldelta - More copy-editing
perldelta for 3428cdc0d3
perldelta - Update entry for b29f65fce6
perldelta - Fill in currently remaining TODO items

9d32676e doesn't need one since it only fixes things that were added post
5.19.3, but [perl #117265] is worth mentioning somewhere so I've added that
to the warnings entry.
perldelta - Remove all but one XXX notices
perldelta - 'nonexistent' should be 'non-existent'
Upgrade CPAN::Meta from version 2.132510 to 2.132620
Merge remote branch 'upstream/blead' into blead