[stlab] update to v1.4.1

[kypp]

• update stlab from 1.3.3 to 1.4.1
• update head reference to develop - the active development branch

[Rastaban]

I am seeing failures on x64-OSX with this update. Are you able to investigate those?

[Rastaban]

It looks like it might be failing due to a missing dependency to the boost unit test framework
config-x64-osx-dbg-err.log
Although DBUILD_TESTING=OFF, so it probably should not be worrying about that dependancy.

[grdowns]

It's due to Mac having a dependency on boost-optional and boost-variant with this update -- not the tests. See the code block at CMakeLists.txt:128

[grdowns]

Adding these dependencies to the CONTROL file as Build-Depends: boost-optional (osx), boost-variant (osx) should fix this update for Mac

[kypp]

Thanks for the input - it appears only boost-variant is obligatory on Mac, but an additional patch was needed to exclude tests as using anything from boost implied them.

I've updated the PR with those changes

[grdowns]

Thanks for getting to the bottom of this, @kypp! Everything looks good