import latest pod/perlpolicy.pod from blead
update perldelta for 5.18.3
bump version to 5.18.3
patchlevel.h: call this v5.18.3-RC0 for now
update META.* for v5.18.3-RC0
Module-CoreList: bump version
Module-CoreList: manual update for v5.18.3
perldelta: fix a typo
Module::CoreList: import updates
patchlevel.h: we are now perl-5.18.3-RC1
sig() should be kill()

There is no sig() function, and the block of text has similar language
to a previous block which uses kill().

For: RT #122662
(cherry picked from commit 9589aa831c3533d85bf7042e049cbe02095df9d3)
Doug Bell is now a Perl 5 author.
Allow blead to compile under some g++

Various platforms are refusing to compile blead with g++ [perl #121151]
This patch, suggested by Tony Cook seems to work.  There may be a better
way to do it, so I'm not closing the ticket, but this gets things
working again.

(cherry picked from commit e9d5f7d5c47a96d94ce10d3b5677a9625fe6c413)
patchlevel.h: we are now perl-5.18.3-RC2
perlhist: import the latest perlhist dates
perldelta: drop final XXX bits, add acknowledgements
patchlevel.h: we are an RC no longer
regenerate META.json to match non-RC status
add new perldelta for possible 5.18.4
bump version to 5.18.4