Fixed haskell/demangle linker errors on systems without static ghc libs

Arch Linux does not install static ghc libraries by default. Running "make run"
without this commit leads to linker errors during the compilation of
haskell/demangle. Compiling demangle with -dynamic fixes this issue.

haskell/Makefile

@@ -1,6 +1,6 @@
 GHC?=ghc
 demangle: demangle.hs
-	$(GHC) -package ghc demangle.hs
+	$(GHC) -package ghc -dynamic demangle.hs
 
 clean:
 	rm demangle.o demangle demangle.hi