test: skip lj-1470 test on RED OS

RED OS for some reason sets `errno` to 2 ENOENT ("No such file or
directory") after the call to `mktime()`. So just skip the test for it.

Author: Buristan

test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua

@@ -1,9 +1,25 @@
 local tap = require('tap')
 
+local function detect_redos()
+  local read_file = require('utils').tools.read_file
+  local hasfile, data = pcall(read_file, '/etc/os-release')
+  if not hasfile then
+    -- Not Linux probably, so not the Red OS.
+    return false
+  else
+    return data:match('RED OS')
+  end
+end
+
 -- The test file demonstrates os.time() fail to return -1 time
 -- value.
 -- See also: https://github.com/LuaJIT/LuaJIT/issues/1470.
-local test = tap.test('lj-1470-os-time-epoch-minus-1s')
+local test = tap.test('lj-1470-os-time-epoch-minus-1s'):skipcond({
+  -- XXX: RED OS for some reason sets `errno` to 2 ENOENT ("No
+  -- such file or directory") after the call to `mktime()`. So
+  -- just skip the test for it.
+  ['RED OS incrorrect behaviour for mktime'] = detect_redos(),
+})
 
 test:plan(1)