Only generate wrapper if specification file changed
Export missing modules
Add more functions for ExecutionEngineBuilder
Add support for LLVMLinkInJIT and LLVMLinkInInterpreter

These functions must be called if you want to use ANY JIT compiler or the interpreter
Add more functions to ExecutionEngine module
Don't bind to global C variables

Doesn't work with GHC. Instead, bind to the address and read with unsafePerformIO
Add support for moduleGetOrInsertFunction
Make the testcase work again