update Hackage download URL in bootstrap.sh

Downloading was failing with curl which seems
not do http redirect by default.

This change simple updates the urls from

Hackage 1's http://hackage.haskell.org/packages/archive/$PKG/$VER/$PKG-$VER.tar.gz to
Hackage 2's http://hackage.haskell.org/package/$PKG-$VER/$PKG-$VER.tar.gz

which makes curl happy and downloads work again.
Merge pull request #1655 from juhp/patch-1

update Hackage download URL in bootstrap.sh
Don't wipe .a metadata on ARM.

See https://github.com/haskell/cabal/pull/1537#issuecomment-33346143 .
Don't use -dylib-install-name on OS X with GHC > 7.8.

Fixes #1660. Based on a patch by Christiaan Baaij.
Merge pull request #1661 from 23Skidoo/no-dylib-install-name

Don't use -dylib-install-name on OS X with GHC > 7.8.
Add BSD2, close #1649
Add MPL-2.0, close #1654
Allow CC and LD be specified as environment variables when bootstrapping.
Add BSD2 and MPL 2.0 to D.C.Init.Licenses.
Require an explicit version for the MPL license.
Support MPL-2.0 and BSD2 in 'cabal init'.
Whitespace.
80-col violations.
Remove duplication between D.S.Haddock and D.C.Haddock.

See #1233.
Typo.
Add more contributors' names.
Remove the BSD3 text from file headers.

It's just noise that duplicates information in the 'LICENSE' file.
Add DragonFly as a known OS to Cabal
Merge pull request #1669 from markuspf/master

Add DragonFly as a known OS to Cabal
Use -prof packages on the Travis build bot.