[packaging] add proper requires to spec

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
[script] remove dependency to awk

Signed-off-by: Juha Kallioinen <juha.kallioinen@jolla.com>
Merge pull request #8 from sailfish-sdk/pkgng

[packaging] add proper requires to spec