libsignal-protocol-c-2.3.1-bp150.2.4

- Remove libsignal-protocol-c-math-lib-shared-lib.patch:
  Contained in new upstream release
- Update to 2.3.1

- Create seperate proper lib package

- Remove: libsignal-protocol-c-link-math.patch:
- Add libsignal-protocol-c-math-lib-shared-lib.patch:
  Upstream added its own version of the mathlib patch, see
  https://github.com/WhisperSystems/libsignal-protocol-c/issues/57
  Additionally I requested library versioning, see:
  https://github.com/WhisperSystems/libsignal-protocol-c/issues/59

- Initial package for openSUSE in version 2.3.0
- Adding libsignal-protocol-c-link-math.patch:
  Link with Math library. Otherwise does not build