locale-related tests aren't guarded by _port in testes/literals.lua

Hi list,

I'm experimenting with Lua tests shipped along with Lua Git
repository[1], and found a failure in literals.lua,

	.../lua: literals.lua:300: assertion failed!
	stack traceback:
		[C]: in global 'assert'
		literals.lua:300: in main chunk
		[C]: in local 'olddofile'
		all.lua:171: in main chunk
		[C]: in ?
	.>>> closing state <<<

and literals.lua:300 looks like

	-- testing decimal point locale
	if os.setlocale("pt_BR") or os.setlocale("ptb") then
	  assert(tonumber("3,4") == 3.4 and tonumber"3.4" == 3.4)
	  assert(tonumber("  -.4  ") == -0.4)

Since I'm running the test on a musl-libc system which doesn't have full
support for locale-related stuff, I've passed -e '_port=true' when
invoking Lua interpreter to test portable behaviors only. While this
parameter correctly disables non-portable tests related to locales in
strings.lua, it doesn't seem to disable such stuff in literals.lua.

Is it intended or a mistake to leave the locale-related test in
literals.lua unguarded? Thanks for the explanation.

Regards,
Yao Zi

[1]: https://github.com/lua/lua/

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