Log Message:
p5-Math-Prime-Util: update to 0.67.

0.67 2017-09-23

    [ADDED]

    - lastfor                         stops forprimes (etc.) iterations
    - is_square(n)                    returns 1 if n is a perfect square
    - is_polygonal(n,k)               returns 1 if n is a k-gonal number

    [FUNCTIONALITY AND PERFORMANCE]

    - shuffle prototype is @ instead of ;@, so matches List::Util.

    - On Perl 5.8 and earlier we will call PP instead of trying
      direct-to-GMP.  Works around a bug in XS trying to turn the
      result into an object where 5.8.7 and earlier gets lost.

    - We create more const integers, which speeds up common uses of
      permutations.

    - CSPRNG now stores context per-thread rather than using a single
      mutex-protected context.  This speeds up anything using random
      numbers a fair amount, especially with threaded Perls.

    - With the above two optimizations, randperm(144) is 2.5x faster.

    - threading test has threaded srand/irand test added back in, showing
      context is per-thread.  Each thread gets its own sequence and calls
      to srand/csrand and using randomness doesn't impact other threads.