lua51-mpack-1.0.6-bp156.3.4

- do not build for Lua 5.2

- Switch to namespaced lua builds
- Specify all options to build for lua52 and lua53

- Fix compilation in openSUSE Leap 42.3.

- Run spec-cleaner.
- Version bump to 1.0.6.
  Upstream changelog:
  Version 1.0.6
  =============
  * It seems luarocks.orgs caches a previously uploaded rockspec
    for a version, even if we explicitly delete the version.
  Version 1.0.5
  =============
  * Bump and adapt build scripts for repository transfer.
- Adapt .spec because the upstream repository changed.
  * libmpack was split into libmpack and libmpack-lua. Hence, now
    we need to download libmpack source code and unpack it into the
    folder mpack-src to build libmapck-lua. Thus, the file
    `libmpack-1.0.5.tar.gz` that contains libmpack v1.0.5 source
    code was added.
- Add patch `lua51-mpack-fix-compilation.patch` to fix a
  compilation problem when using `USE_SYSTEM_LUA=1`. For more
  information, see gh#libmpack/libmpack-lua#2 .
- Add patch `lua51-mpack-fix-gcc7.patch` to fix a compilation
  failure when using GCC7. For more information, see
  gh#libmpack/libmpack-lua#3 .

- Version bump to 1.0.3.
  * No changelog available.

- Initial version.