eliminate PL_regsize

This var (or rather PL_reg_state.re_state_regsize, which it is #deffed to)
just holds the index of the maximum opening paren index seen so far in
S_regmatch(). So make it a local var of S_regmatch() and pass it as a
param to the couple of static functions called from there that need it.

(Also give the local var the more meaningful name 'maxopenparen'.)
perl5180delta: Mention 2 more broken+patched modules
Make DosGlob.t more resilient

If the sv count goes *down* (which doesn’t happen on my machine, but see
<CANgJU+W8_nVg9-YVRBe2r=ZYCbu9-R3RPf0tbH-XWrtVxYhGpA@mail.gmail.com>), we
certainly don’t have a leak.
rough TODO test for t expr
fix the debugger t expr command regression
SKIP in run_multiple_progs() was parsed but unimplemented, implement it
skip the \N{...} unloaded charnames croak test when PERL_UNICODE set

This has been causing failures for a while.
GDBM_File must cast fatal_func appropriately for the version of gdbm.h

The fifth argument to gdbm_open() is an optional callback function for fatal
errors. The prototype for this function has changed between gdbm 1.8.3 and
1.9.0, from void (*)() to void(*)(const char *). This distinction doesn't
matter to a C compiler, but does to a C++ compiler, which we use to test the
core build. So, cast appropriately, depending on the version macros in
gdbm.h
Update Scalar-List-Utils to CPAN version 1.26

  [DELTA]

  1.26 -- Sun Dec 16 19:39

    * Merge patch from JDHEDDEN - Add Scalar::Util::isdual() RT#76150

  1.25_01 -- Wed Nov 21 09:47

    * Fix a hash order dependency bug t/tainted.t
      (Currently this is a core only version to fix perl5 smokes)
Update ExtUtils-MakeMaker to CPAN version 6.64

  [DELTA]

  6.64  Sun Dec 16 18:27:40 PST 2012
    Build Fixes
    * Update the home page in the meta file.  makemaker.org has been
      unmaintained for a while.

  6.63_04  Thu Nov 22 13:18:06 PST 2012
    Test Fixes
    * Eliminated the problematic and not very useful PASTHRU test
      on Windows.  A better test will come after stable. [github 41]
      (Michael G Schwern)
    * Avoid a new regex warning in 5.17.x in t/MM_OS2.t. (Craig A. Berry)

    VMS Fixes
    * Better ignore files due to non-case-preserving filesystems.
      (Craig A. Berry)
use PERL_UNUSED_VAR rather than PERL_UNUSED_DECL

PERL_UNUSED_DECL doesn't do anything under g++, so doing this silences
some g++ warnings.
Work in progress on perldelta for 23b7025ebc

I still need to figure out what some of the changes described in
http://www.nntp.perl.org/group/perl.perl5.porters/2012/10/msg194211.html
actually mean.
Look up RT authors in the DATA section aliases as well as AUTHORS

This patch is a little gross but if fixes a bug where an author wasn't found
at all. The author in question was in the git log as "bulk88 (via RT)
<perlbug-followup@perl.org>". Note the lack of a name before the "(via RT)"
part.

This whole thing is a bit of a mess. I think this whole script could be
re-organized in a simpler way, perhaps.
Remove all the boilerplate notes from perldelta
Add the generated Acknowledgements section to perldelta
s/5.17.5/5.17.6/ in the INSTALL document
Fix some weird formatting in perldelta
Fix typo in Locale-Maketext ChangeLog
Add delta for Storable & Locale::Maketext security issues
Add an =item marker for sub-list in perldelta