pcre2: Update to 10.37

pcre2: Update to 10.37

- Update from 10.36 to 10.37
- Update rootfile
- find-dependencies run to check impact of so lib bump
   No issues found
- Changelog
   Version 10.37 26-May-2021
    1. Change RunGrepTest to use tr instead of sed when testing with binary
       zero bytes, because sed varies a lot from system to system and has problems
       with binary zeros. This is from Bugzilla #2681. Patch from Jeremie
       Courreges-Anglas via Nam Nguyen. This fixes RunGrepTest for OpenBSD. Later:
       it broke it for at least one version of Solaris, where tr can't handle binary
       zeros. However, that system had /usr/xpg4/bin/tr installed, which works OK, so
       RunGrepTest now checks for that command and uses it if found.
    2. Compiling with gcc 10.2's -fanalyzer option showed up a hypothetical problem
       with a NULL dereference. I don't think this case could ever occur in practice,
       but I have put in a check in order to get rid of the compiler error.
    3. An alternative patch for CMakeLists.txt because 10.36 #4 breaks CMake on
       Windows. Patch from email@cs-ware.de fixes bugzilla #2688.
    4. Two bugs related to over-large numbers have been fixed so the behaviour is
       now the same as Perl.
       (a) A pattern such as /\214748364/ gave an overflow error instead of being
           treated as the octal number \214 followed by literal digits.
       (b) A sequence such as {65536 that has no terminating } so is not a
           quantifier was nevertheless complaining that a quantifier number was too big.
    5. A run of autoconf suggested that configure.ac was out-of-date with respect
       to the lastest autoconf. Running autoupdate made some valid changes, some valid
       suggestions, and also some invalid changes, which were fixed by hand. Autoconf
       now runs clean and the resulting "configure" seems to work, so I hope nothing
       is broken. Later: the requirement for autoconf 2.70 broke some automatic test
       robots. It doesn't seem to be necessary: trying a reduction to 2.60.
    6. The pattern /a\K.(?0)*/ when matched against "abac" by the interpreter gave
       the answer "bac", whereas Perl and JIT both yield "c". This was because the
       effect of \K was not propagating back from the full pattern recursion. Other
       recursions such as /(a\K.(?1)*)/ did not have this problem.
    7. Restore single character repetition optimization in JIT. Currently fewer
       character repetitions are optimized than in 10.34.
    8. When the names of the functions in the POSIX wrapper were changed to
       pcre2_regcomp() etc. (see change 10.33 #4 below), functions with the original
       names were left in the library so that pre-compiled programs would still work.
       However, this has proved troublesome when programs link with several libraries,
       some of which use PCRE2 via the POSIX interface while others use a native POSIX
       library. For this reason, the POSIX function names are removed in this release.
       The macros in pcre2posix.h should ensure that re-compiling fixes any programs
       that haven't been compiled since before 10.33.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>