Makefile & configure: make PCRE v2 the default PCRE implementationab/grep-pcre-v2

Change the USE_LIBPCRE=YesPlease & --with-libpcre flags to the
Makefile & configure script, respectively, to mean use PCRE v2, not
PCRE v1.

The legacy library previously available via those options is still
available on request via USE_LIBPCRE1=YesPlease or
--with-libpcre1. The existing USE_LIBPCRE2=YesPlease & --with-libpcre2
still explicitly ask for v2.

The v2 PCRE is stable & end-user compatible, all this change does is
change the default. Someone building a new git is likely to also have
packaged PCRE v2 sometime in the last 2 years since it was released.
If not they can choose to use the legacy v2 library by making the
trivial s/USE_LIBPCRE/USE_LIBPCRE1/ change, or package up PCRE v2.

New releases of PCRE v2 are already faster than PCRE v1, and not only
is all significant development is happening on v2, but bugs in
reported against v1 have started getting WONTFIX'd asking users to
just upgrade to v2.

So it makes sense to give our downstream distributors a nudge to
switch over to it.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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