Log Message:
Changes 1.37:
* Updated test files from the Math::BigInt distribution
* Updated bundled Devel::CheckLib from v0.92 to v0.93
* Math::BigInt::GMP now requires Math::BigInt v1.997
* Include "^MYMETA\.(yml|json)\z" in MANIFEST.SKIP. Whereas META.* are
  generated by the distribution author at packaging time, MYMETA.* are
  generated by the end user at configure time after any dynamic dependencies
  are known.
* Changed Makefile.PL so that a "make dist" makes a META.yml and META.json.
* Updated common test files from the Math::BigInt distribution.