xmobar: drop obsolete patch files

pkgs/applications/misc/xmobar/add-freeration-variable.patch

@@ -1,58 +0,0 @@
-diff --git a/readme.md b/readme.md
-index f4f07e8..de679c7 100644
---- a/readme.md
-+++ b/readme.md
-@@ -645,7 +645,7 @@ something like:
- - Args: default monitor arguments
- - Variables that can be used with the `-t`/`--template` argument:
-              `total`, `free`, `buffer`, `cache`, `rest`, `used`,
--             `usedratio`, `usedbar`, `freebar`
-+             `usedratio`, `usedbar`, `freeratio`, `freebar`
- - Default template: `Mem: <usedratio>% (<cache>M)`
- 
- ### `Swap Args RefreshRate`
-diff --git a/src/Plugins/Monitors/Mem.hs b/src/Plugins/Monitors/Mem.hs
-index 5c55ee2..3cf46c7 100644
---- a/src/Plugins/Monitors/Mem.hs
-+++ b/src/Plugins/Monitors/Mem.hs
-@@ -19,8 +19,8 @@ import Plugins.Monitors.Common
- memConfig :: IO MConfig
- memConfig = mkMConfig
-        "Mem: <usedratio>% (<cache>M)" -- template
--       ["usedbar", "freebar", "usedratio", "total",
--        "free", "buffer", "cache", "rest", "used"]  -- available replacements
-+       ["usedbar", "freebar", "usedratio", "freeratio", "total",
-+        "free", "buffer", "cache", "rest", "used"] -- available replacements
- 
- fileMEM :: IO String
- fileMEM = readFile "/proc/meminfo"
-@@ -33,7 +33,8 @@ parseMEM =
-            rest = free + buffer + cache
-            used = total - rest
-            usedratio = used / total
--       return [usedratio, total, free, buffer, cache, rest, used]
-+           freeratio = free / total
-+       return [usedratio, freeratio, total, free, buffer, cache, rest, used, freeratio]
- 
- totalMem :: IO Float
- totalMem = fmap ((*1024) . (!!1)) parseMEM
-@@ -42,15 +43,16 @@ usedMem :: IO Float
- usedMem = fmap ((*1024) . (!!6)) parseMEM
- 
- formatMem :: [Float] -> Monitor [String]
--formatMem (r:xs) =
-+formatMem (r:fr:xs) =
-     do let f = showDigits 0
-            rr = 100 * r
-        ub <- showPercentBar rr r
-        fb <- showPercentBar (100 - rr) (1 - r)
-        rs <- showPercentWithColors r
-+       fs <- showPercentWithColors fr
-        s <- mapM (showWithColors f) xs
--       return (ub:fb:rs:s)
--formatMem _ = return $ replicate 9 "N/A"
-+       return (ub:fb:rs:fs:s)
-+formatMem _ = return $ replicate 10 "N/A"
- 
- runMem :: [String] -> Monitor String
- runMem _ =