Update to 1.38
    
    - New upstream release 1.38
      - Updated test files from the Math::BigInt distribution
      - Updated POD
      - Updated bundled Devel::CheckLib from v0.93 to v1.01
    - Classify buildreqs by usage
    - Use features from recent EU::MM since we need Math::BigInt ≥ 1.9993
    - Always run the test suite
    - Improve %summary and %description
    - Use %license
    - Make %files list more explicit
    - Remove spurious exec permissions from text files
    - Don't need to remove empty directories from the buildroot
    - Use DESTDIR rather than PERL_INSTALL_ROOT
    - Don't use macros for commands