Remove a bunch of unreferenced files

Plus a small number of obsolete packages (like old versions of qemu).

pkgs/development/libraries/haskell/attoparsec-binary/attoparsec-binary-ghc7.6.1.patch

@@ -1,20 +0,0 @@
-diff --git a/Data/Attoparsec/Binary.hs b/Data/Attoparsec/Binary.hs
-index fab76c6..01d6c8b 100644
---- a/Data/Attoparsec/Binary.hs
-+++ b/Data/Attoparsec/Binary.hs
-@@ -23,7 +23,7 @@ import Data.Word
- byteSize :: (Bits a) => a -> Int
- byteSize = (`div` 8) . bitSize
- 
--pack :: (Bits a) => B.ByteString -> a
-+pack :: (Bits a, Num a) => B.ByteString -> a
- pack = B.foldl' (\n h -> (n `shiftL` 8) .|. fromIntegral h) 0
- 
- anyWordN :: (Bits a) => (B.ByteString -> a) -> Parser a
-@@ -84,4 +84,4 @@ word64be = wordN unpack
- 
- -- |Match a specific 64-bit little-endian word.
- word64le :: Word64 -> Parser Word64
--word64le = wordN $ B.reverse . unpack
-\ No newline at end of file
-+word64le = wordN $ B.reverse . unpack