Fix configuration of SBT incremental compiler
Fix configuration of SBT incremental compiler

We want to use the (old) rules for incremental compilation
after editing files with macro definitions, as the new
rules lead to a lot of recompiles.

We'd previously configured this, but the change had been
somehow broken by a more recent change to the incremental
compiler options.

This commit moves both of the configs to the same part of
our build, which seems to make it stick:

```
% sbt consoleProject
> (incOptions in LocalRootProject).eval.recompileOnMacroDef
false
```

martijnhoekstra/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,lrytz/scala,lrytz/scala,martijnhoekstra/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,martijnhoekstra/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,scala/scala,scala/scala,lrytz/scala