Remove Makefile from cabal tarball; man page building is now handled by a small haskell program.

This actually runs faster than building the man pages from the makefile
did. But the main purpose is to let Setup.hs import Build.Mans and so not
need the makefile.

Setup.hs

@@ -14,11 +14,13 @@ import Control.Applicative
 import Control.Monad
 import System.Directory
 import Data.List
+import Data.Maybe
 import Control.Exception
 import qualified System.Info
 
 import qualified Build.DesktopFile as DesktopFile
 import qualified Build.Configure as Configure
+import Build.Mans (buildMans)
 import Utility.SafeCommand
 
 main :: IO ()
@@ -51,13 +53,10 @@ installManpages copyDest verbosity pkg lbi =
 	installOrdinaryFiles verbosity dstManDir =<< srcManpages
   where
 	dstManDir   = mandir (absoluteInstallDirs pkg lbi copyDest) </> "man1"
-	srcManpages = do
-		havemans <- boolSystem "make" [Param "mans"]
-		if havemans
-			then zip (repeat "man")
-				. filter (".1" `isSuffixOf`)
-				<$> getDirectoryContents "man"
-			else return []
+	-- If mdwn2man fails, perhaps because perl is not available,
+	-- we just skip installing man pages.
+	srcManpages = zip (repeat "man") . map takeFileName . catMaybes
+		<$> buildMans
 
 installDesktopFile :: CopyDest -> Verbosity -> PackageDescription -> LocalBuildInfo -> IO ()
 installDesktopFile copyDest _verbosity pkg lbi