pegtl-2.8.1-bp152.1.1

- Update to version 2.8.1:
  * Too many changes to list here, see
    https://github.com/taocpp/PEGTL/releases
  * This is API incompatible to version 1.x, but no package
    has a build dependency on the old version, while usbguard and
    Paraview require 2.6.0 and 2.4.0 at least.

- Replace old RPM shell vars by macros. Trim description of SRPM.
  Have testsuite built and run in parallel.

- 1.3.1 pegtl version to meet usbguard requirements.

- header only parsing library based on C++ templates.