Write win32/config.h with *nix EOLs, as per the canned config_H.* files

This makes no difference when actually building perl, but saves a dos2unix
when regenerating the canned files with the regen_config_h makefile targets.
Update win32/config_H.[gv]c canned configuration files

The win32/config.[gv]c files are generally kept up to date these days (and
we have tests to check that) so no changes are required in them.

The win32/config_H.[gv]c files are regenerated as per instructions in the
win32/Makefile and win32/makefile.mk, being careful to restore a couple of
things otherwise lost from the config_H.gc file. The files are now in sync
with the top-level master configuration file, config_h.SH.