PCRE v2 compile error, was Re: What's cooking in git.git (May 2017, #01; Mon, 1)

> * ab/grep-pcre-v2 (2017-04-25) 20 commits
>  - SQUASH???
>  - Makefile & configure: make PCRE v2 the default PCRE implementation
>  - grep: remove support for concurrent use of both PCRE v1 & v2
>  - grep: add support for PCRE v2
>  - grep: add support for the PCRE v1 JIT API
>  - perf: add a performance comparison test of grep -E and -P
>  - grep: change the internal PCRE code & header names to be PCRE1
>  - grep: change the internal PCRE macro names to be PCRE1
>  - test-lib: rename the LIBPCRE prerequisite to PCRE
>  - grep: make grep.patternType=[pcre|pcre1] a synonym for "perl"
>  - grep & rev-list doc: stop promising libpcre for --perl-regexp
>  - log: add -P as a synonym for --perl-regexp
>  - log: add exhaustive tests for pattern style options & config
>  - grep: add a test for backreferences in PCRE patterns
>  - Makefile & configure: reword outdated comment about PCRE
>  - grep: remove redundant `regflags &= ~REG_EXTENDED` assignments
>  - grep: remove redundant regflags assignment under PCRE
>  - grep: submodule-related case statements should die if new fields are added
>  - grep: add tests for grep pattern types being passed to submodules
>  - grep: amend submodule recursion test in preparation for rx engine testing
> 
>  PCRE2, which has an API different from and incompatible with PCRE,
>  can now be chosen to support "grep -P -e '<pattern>'" and friends.