pcre2: update to 10.32.

Version 10.32 10-September-2018
-------------------------------

This is another mainly bugfix and tidying release with a few minor
enhancements. These are the main ones:

1. pcre2grep now supports the inclusion of binary zeros in patterns that are
read from files via the -f option.

2. ./configure now supports --enable-jit=auto, which automatically enables JIT
if the hardware supports it.

3. In pcre2_dfa_match(), internal recursive calls no longer use the stack for
local workspace and local ovectors. Instead, an initial block of stack is
reserved, but if this is insufficient, heap memory is used. The heap limit
parameter now applies to pcre2_dfa_match().

4. Updated to Unicode version 11.0.0.

5. (*ACCEPT:ARG), (*FAIL:ARG), and (*COMMIT:ARG) are now supported.

6. Added support for \N{U+dddd}, but only in Unicode mode.

7. Added support for (?^) to unset all imnsx options.

(wiz)