avoid using short lib names that clash with unix command names

Build/OSXMkLibs.hs

@@ -103,9 +103,8 @@ getLibName lib libmap = case M.lookup lib libmap of
 	Just n -> (n, libmap)
 	Nothing -> (nextfreename, M.insert lib nextfreename libmap)
   where
-	names = map (\c -> [c]) letters ++
-		[[l1, l2] | l1 <- letters, l2 <- letters]
-	letters = ['a' .. 'z'] ++ ['0' .. '9']
+	names = map (\c -> [c]) ['A' .. 'Z'] ++
+		[[n, l] | n <- ['0' .. '9'], l <- ['A' .. 'Z']
 	used = S.fromList $ M.elems libmap
 	nextfreename = fromMaybe (error "ran out of short library names!") $ 
 		headMaybe $ dropWhile (`S.member` used) names