Log Message:
py-sip: updated to 4.19.18

v4.19.18:
- Bug fixes.

v4.19.17:
- Bug fixes.

v4.19.16:
- Added support for the Haiku platform.
- Bug fixes.

v4.19.15:
- Bug fixes.

v4.19.14:
- The reference count displayed by sip.dump() now has the same caveat as
  sys.getrefcount().
- Added SIP_NULLPTR to the public API.
- Added support for size_t.
- Added sipLong_AsSizeT() to the C API.
- Added the '=' format characters to sipBuildResult() and sipParseResult().
- Bug fixes.