Warn if 'license-file' is absolute or outside of source tree (fixes #2742)
Warn if 'license-file' is absolute or outside of source tree (fixes #2742)

kolmodin/cabal,headprogrammingczar/cabal,lukexi/cabal,eric-stanley/cabal,Heather/cabal,x-y-z/cabal,enolan/cabal,edsko/cabal,gbaz/cabal,Peaker/cabal,valderman/cabal,edsko/cabal,martinvlk/cabal,gbaz/cabal,randen/cabal,mydaum/cabal,themoritz/cabal,enolan/cabal,sopvop/cabal,beni55/cabal,bennofs/cabal,mmakowski/cabal,x-y-z/cabal,themoritz/cabal,garetxe/cabal,randen/cabal,trskop/cabal,valderman/cabal,ghc-android/cabal,thoughtpolice/cabal,thomie/cabal,martinvlk/cabal,Peaker/cabal,mydaum/cabal,beni55/cabal,kolmodin/cabal,trskop/cabal,bennofs/cabal,thomie/cabal,mmakowski/cabal,eric-stanley/cabal,lukexi/cabal,headprogrammingczar/cabal,ghc-android/cabal,garetxe/cabal,Heather/cabal,themoritz/cabal,sopvop/cabal,sopvop/cabal,thoughtpolice/cabal