recompilation bug with -dynamic-too

Consider the scenario

1. A user compiles a module with and without -dynamic to create .hi and .dyn_hi files. They use different options for each (ones which affect the recompilation checker).
2. They then try to recompile using --make mode.
3. We should recompile because .hi and .dyn_hi do not match (they were compiled with different flags)

At the moment we will not recompile because the flags hash is not included in the interface hash.

There is already a similar test for this dynamicToo001MakeB, but it changes the source file rather than any options.

Root cause: The flags hash is not included in the interface hash.