simple test for linker

Test case for symbols not being linked for "library" build. 

```
Linking dist/build/test/test ...
dist/build/test/test-tmp/Main.o:(.text+0x27): undefined reference to `openblas_set_num_threads'
collect2: error: ld returned 1 exit status
```

Initial thought was ``Ghc-Options: -static -optl-pthread `` would fix this, but this it doesn't link for reasons for I don't understand yet.