deal with Android's nonstandard shell location

This is so gratutious and pointless. It's a shame that everything we
learned about Unix portability and the importance of standards has been
thrown out the window by these guys.

Utility/Shell.hs

@@ -0,0 +1,20 @@
+{- /bin/sh handling
+ -
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# LANGUAGE CPP #-}
+
+module Utility.Shell where
+
+shellPath :: FilePath
+#ifndef WITH_ANDROID
+shellPath = "/bin/sh"
+#else
+shellPath = "/system/bin/sh"
+#endif
+
+shebang :: String
+shebang = "#!" ++ shellPath