update build scripts for 0.5.0 release

For Debian package:

* Add oniguruma build
* Remove re2 & pficommon build

For RPM package:

* Add oniguruma dependency (it is provided by the standard repos.)
* Remove re2 & pficommon build

The following parameters require git treeish, so if you're going to test them before 0.5.0 release, you need to:

* Change `JUBATUS_VER="0.5.0"` to `"develop"` in `packaging/allinone/jubapkg_version` (for Debian pkgs)
* Change `JUBATUS_CHECKOUT="${JUBATUS_VERSION}"` to `"develop"` in `packaging/rpm/package-config` (for RPM pkgs)