rempve some unused files

ghc/misc/examples/cats/ccat4.c

ghc/misc/examples/cats/ccat5.c

ghc/misc/examples/cats/hcat1.hs

ghc/misc/examples/cats/hcat2.hs

ghc/misc/examples/cats/hcat3.hs

ghc/misc/examples/cats/hcat4.hs

ghc/misc/examples/cats/hcat5.hs

ghc/misc/examples/cats/hcat6.hs

ghc/misc/examples/cats/mangle_times

ghc/misc/examples/hsh/Hsh.hs

ghc/misc/examples/hsh/Makefile

ghc/misc/examples/io/io001/Main.hs

ghc/misc/examples/io/io002/Main.hs

ghc/misc/examples/io/io003/Main.hs

ghc/misc/examples/io/io004/Main.hs

ghc/misc/examples/io/io005/Main.hs

ghc/misc/examples/io/io006/Main.hs

ghc/misc/examples/io/io007/Main.hs

ghc/misc/examples/io/io008/Main.hs

ghc/misc/examples/io/io009/Main.hs