Fix evalDeps package ids with - in name

[hamishmack]

Instead of just striping off the version number from the end of each package sed is removing all the - characters as well. This bug was corrected here, but not here.

I am not sure what this would have broken downstream (if anything), but it causes errors in the log like this:

js-unknown-ghcjs-ghc-pkg: cannot find package ghcboot
js-unknown-ghcjs-ghc-pkg: cannot find package ghcbootth
js-unknown-ghcjs-ghc-pkg: cannot find package ghccompact
js-unknown-ghcjs-ghc-pkg: cannot find package ghcheap
js-unknown-ghcjs-ghc-pkg: cannot find package ghcprim
js-unknown-ghcjs-ghc-pkg: cannot find package ghcjsprim
js-unknown-ghcjs-ghc-pkg: cannot find package ghcjsth
js-unknown-ghcjs-ghc-pkg: cannot find package integergmp

[angerman]

LGTM