Revive 'pcre2-chartables-leakfix'

As I had stated several times, I was really unhappy how the original fix harped on nedmalloc and totally ignored runtime-configured custom allocators.

So this is, at long last, my attempt to give this a new life. It is based off of maint and needs trivial merge conflict resolutions relative to master .

Changes since v1:

* I managed to mess up the authorship of 3/3. Sorry for that. I fixed it, so that Carlo is shown as author again.

Carlo Marcelo Arenas Belón (3):
grep: make PCRE1 aware of custom allocator
grep: make PCRE2 aware of custom allocator
grep: avoid leak of chartables in PCRE2

 builtin/grep.c |  1 +
 grep.c         | 47 ++++++++++++++++++++++++++++++++++++++++++++---
 grep.h         |  2 ++
 3 files changed, 47 insertions(+), 3 deletions(-)

base-commit: 51cf315870bbb7254ddf06c84fe03b41bc48eebd
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-402%2Fdscho%2Fpcre2-chartables-leakfix-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-402/dscho/pcre2-chartables-leakfix-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/402

Range-diff vs v1:

 1:  4feb8cc83a = 1:  4feb8cc83a grep: make PCRE1 aware of custom allocator
 2:  191d3a2280 = 2:  191d3a2280 grep: make PCRE2 aware of custom allocator
 3:  f21b2c9eb5 ! 3:  f8724fb267 grep: avoid leak of chartables in PCRE2

@@ -1,4 +1,4 @@
-Author: Johannes Schindelin <[email protected]> +Author: Carlo Marcelo Arenas Belón <[email protected]>

grep: avoid leak of chartables in PCRE2

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