[req] remove libx11-dev from the list, it's pulled in by gtk2.0-dev

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
Merge branch 'master' of github.com:sailfish-sdk/sdk-build-tools
[be-script] improvements to the build engine script

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
Merge pull request #1 from kaltsi/improvements

Improvements