Use get_cache_dir() instead of getdir("cache") everywhere

Just because I like that function more. :-)

Signed-off-by: Uli Schlachter <psychon@znc.in>

awesomerc.lua

@@ -318,7 +318,7 @@ globalkeys = awful.util.table.join(
                   awful.prompt.run({ prompt = "Run Lua code: " },
                   mypromptbox[awful.screen.focused()].widget,
                   awful.util.eval, nil,
-                  awful.util.getdir("cache") .. "/history_eval")
+                  awful.util.get_cache_dir() .. "/history_eval")
               end,
               {description = "lua execute prompt", group = "awesome"}),
     -- Menubar

lib/awful/widget/prompt.lua

@@ -27,7 +27,7 @@ local function run(promptbox)
                           promptbox:spawn_and_handle_error(...)
                       end,
                       completion.shell,
-                      util.getdir("cache") .. "/history")
+                      util.get_cache_dir() .. "/history")
 end
 
 local function spawn_and_handle_error(self, ...)

lib/menubar/init.lua

@@ -315,7 +315,7 @@ function menubar.show(scr)
     awful.prompt.run(prompt_args, instance.prompt.widget,
                 function(s) end,            -- exe_callback function set to do nothing
                 awful.completion.shell,     -- completion_callback
-                awful.util.getdir("cache") .. "/history_menu",
+                awful.util.get_cache_dir() .. "/history_menu",
                 nil,
                 menubar.hide, function(query) menulist_update(query, scr) end,
                 prompt_keypressed_callback