Request SList internal information from the CURL session

Property definitions

curl $ NativeCurl :: easy_getinfo_slist
	# Request SList internal information from the CURL session
	fun easy_getinfo_slist(opt: CURLInfoSList): nullable Array[String]
	do
		var answ = new Ref[CURLSList](new CURLSList)
		if not native_getinfo_slist(opt, answ).is_ok then return null

		var native = answ.item
		var nity = native.to_a
		native.destroy
		return nity
	end
lib/curl/native_curl.nit:166,2--176,4