fix(man.lua): useless executability check #33438

Problem:
executability check using `uv.fs_access`
doesn't work currently and can't work on windows

Solution:
only check for executable with `vim.fn.executable`

runtime/lua/man.lua

@@ -9,9 +9,7 @@ local M = {}
 --- @return string
 local function system(cmd, silent, env)
   if vim.fn.executable(cmd[1]) == 0 then
-    error(string.format('not found: "%s"', cmd[1]), 0)
-  elseif vim.uv.fs_access(cmd[1], 'X') then
-    error(string.format('not executable : "%s"', cmd[1]), 0)
+    error(string.format('executable not found: "%s"', cmd[1]), 0)
   end
 
   local r = vim.system(cmd, { env = env, timeout = 10000 }):wait()