Fix permission of text files within archive.

README.iwlwifi-3945-ucode and LICENSE.iwlwifi-3945-ucode were mistakenly marked
as an executable. Was uncertain if iwlwifi-3945-2.ucode should or should not
be marked as an executable and was unchanged.
Fix permission of text files within archive.

LICENSE.iwlwifi-4965-ucode and README.iwlwifi-4965-ucode were mistakenly marked
as executables.