Patch fast-logger to build with directory-1.3.8.*

Code adapted from https://github.com/kazu-yamamoto/logger/pull/205

patches/fast-logger-3.1.1.patch

+diff --git a/System/Log/FastLogger/File.hs b/System/Log/FastLogger/File.hs
+index e8c4240..bd53357 100644
+--- a/System/Log/FastLogger/File.hs
++++ b/System/Log/FastLogger/File.hs
+@@ -1,4 +1,7 @@
++{-# LANGUAGE CPP #-}
++#if !MIN_VERSION_directory(1,3,8)
+ {-# LANGUAGE Safe #-}
++#endif
+ 
+ module System.Log.FastLogger.File
+     ( FileLogSpec(..)