Add PCRE2 as explicit package again
* configure.ac: Add pcre2 as a qtbase dependency. * packages/packages.common (pcre2): New. Its signed \o/ * src/Makefile.am (gpg4win_kdepkgs): Add it. (gpg4win_pkg_pcre2_configure): Add basic config for qt. (gpg4win_pkg_qtbase_configure): Use system-pcre. * src/inst-pcre2.nsi, src/uninst-pcre2.nsi: New. * src/inst-sections.nsi, src/config.nsi.in: Update accordingly.
This ensures that we no longer implicitly use a version
which is unknown to us from Qt and makes it easier to check
our software contents by not using libraries shipped with
other packages. Except for sqlite.