Native Windows: Eina: Resolve bad comparison while using windows strerror_s
strerror_s is the windows alternative of strerror_r used by EFL.
strerror_s never return the error code with the message as
strerror_r does, because of that, while comparing the first 14
characters of Unknown error to the message from unknown code 4096
(Unknown error) they were accusing being different - in UNIX this
works because the message returned is Unknown error 4096.
This error was noticeable at eina_error_test_failures test case.
This Diff adds the error code to the message in case of an `Unknown
error`, making the windows implementation compliant with UNIX.
Reviewed-by: Vincent Torri <email@example.com>
Reviewed-by: Wander Lairson Costa <firstname.lastname@example.org>
Reviewed-by: Stefan Schmidt <email@example.com>
Differential Revision: https://phab.enlightenment.org/D12033