qAddDependentFile is broken with new-install

minimal reproducible project https://github.com/hasufell/new-install-fail

new-install:
```
$ cabal new-install -j1 exe:new-install-fail
Wrote tarball sdist to
/home/maerwald/git/new-install-fail/dist-newstyle/sdist/new-install-fail-0.1.0.0.tar.gz
Resolving dependencies...
Build profile: -w ghc-8.6.2 -O1
In order, the following will be built (use -v for more details):
- new-install-fail-0.1.0.0 (exe:new-install-fail) (requires build)
Configuring executable 'new-install-fail' for new-install-fail-0.1.0.0..
Preprocessing executable 'new-install-fail' for new-install-fail-0.1.0.0..
Building executable 'new-install-fail' for new-install-fail-0.1.0.0..
[1 of 1] Compiling Main ( src/Main.hs, dist/build/new-install-fail/new-install-fail-tmp/Main.o )

: error:
resources/foo.md: openBinaryFile: does not exist (No such file or directory)
Warning: Some package(s) failed to build. Try rerunning with -j1 if you can't
see the error.
```

new-build:
```
$ cabal new-build -j1 exe:new-install-fail
Resolving dependencies...
Build profile: -w ghc-8.6.2 -O1
In order, the following will be built (use -v for more details):
- new-install-fail-0.1.0.0 (exe:new-install-fail) (first run)
Configuring executable 'new-install-fail' for new-install-fail-0.1.0.0..
Preprocessing executable 'new-install-fail' for new-install-fail-0.1.0.0..
Building executable 'new-install-fail' for new-install-fail-0.1.0.0..
[1 of 1] Compiling Main ( src/Main.hs, /home/maerwald/git/new-install-fail/dist-newstyle/build/x86_64-linux/ghc-8.6.2/new-install-fail-0.1.0.0/x/new-install-fail/build/new-install-fail/new-install-fail-tmp/Main.o )
Linking /home/maerwald/git/new-install-fail/dist-newstyle/build/x86_64-linux/ghc-8.6.2/new-install-fail-0.1.0.0/x/new-install-fail/build/new-install-fail/new-install-fail ...
```