testsuite: Add stderr output for UnsafeInfered02 on Windows

This test uses TemplateHaskell causing GHC to build dynamic objects on
platforms where dynamic linking is available. However, Windows doesn't support
dynamic linking. Consequently the test would fail on Windows with:

```patch
--- safeHaskell/safeInfered/UnsafeInfered02.run/UnsafeInfered02.stderr.normalised	2019-06-04 15:10:10.521594200 +0000
+++ safeHaskell/safeInfered/UnsafeInfered02.run/UnsafeInfered02.comp.stderr.normalised	2019-06-04 15:10:10.523546200 +0000
@@ -1,5 +1,5 @@
-[1 of 2] Compiling UnsafeInfered02_A ( UnsafeInfered02_A.hs, UnsafeInfered02_A.o, UnsafeInfered02_A.dyn_o )
-[2 of 2] Compiling UnsafeInfered02  ( UnsafeInfered02.hs, UnsafeInfered02.o, UnsafeInfered02.dyn_o )
+[1 of 2] Compiling UnsafeInfered02_A ( UnsafeInfered02_A.hs, UnsafeInfered02_A.o )
+[2 of 2] Compiling UnsafeInfered02  ( UnsafeInfered02.hs, UnsafeInfered02.o )

 UnsafeInfered02.hs:4:1:
     UnsafeInfered02_A: Can't be safely imported!
```

The other approach I considered for this issue is to pass `-v0` to GHC.
However, I felt we should probably do this consistently for all of the tests in
this directory and this would take more time than I currently have.

testsuite/tests/safeHaskell/safeInfered/UnsafeInfered02.stderr-mingw32

+[1 of 2] Compiling UnsafeInfered02_A ( UnsafeInfered02_A.hs, UnsafeInfered02_A.o )
+[2 of 2] Compiling UnsafeInfered02  ( UnsafeInfered02.hs, UnsafeInfered02.o )
+
+UnsafeInfered02.hs:4:1: error:
+    UnsafeInfered02_A: Can't be safely imported!
+    The module itself isn't safe.
+