GHC incorrectly concludes rebuild unnecessary, even when ghc-options have changed

Steps:
1. Compile your program (using `new-build`). Realize it has a space leak.
2. Change cabal.project to:

```
package ingest
ghc-options: -fno-full-laziness
```
1. Call `new-build` again:

```
# cabal new-build
In order, the following will be built (use -v for more details):
- ingest-0.1.0.0 (lib) --enable-profiling (configuration changed)
- ingest-0.1.0.0 (exe:ingest) --enable-profiling (configuration changed)
Configuring component lib from ingest-0.1.0.0
Preprocessing library ingest-0.1.0.0...
Configuring component exe:ingest from ingest-0.1.0.0
Preprocessing executable 'ingest' for ingest-0.1.0.0...
```

Note that although it detected "configuration changed", nothing actually got recompiled. The change only takes effect after I manually delete the `dist-newstyle` directory and rebuild again.