Revert "Remove unused dependency"

This reverts commit 14908e9.

What a fool I was for thinking that `cabal build all` would actually build *all* components...

Author: georgefst

evdev/evdev.cabal

@@ -23,6 +23,7 @@ common common
         bytestring ^>= {0.10, 0.11},
         containers ^>= 0.6.2,
         extra ^>= {1.6.18, 1.7},
+        filepath-bytestring ^>= 1.4.2,
         monad-loops ^>= 0.4.3,
         rawfilepath ^>= 1.0.0,
         time ^>= {1.9.3, 1.10, 1.11, 1.12, 1.13},