Add copy of gpg-authcode-sign.sh and use it
* build-aux/authenticode-sign.sh: Removed. * build-aux/gpg-authcode-sign.sh: New. * src/Makefile.am (stamp-additional-signfiles): Call AUTHENTICODE_sign. * src/gpg4win.mk.in (AUTHENTICODE_sign): Use gpg-authcode-sign.sh.
Since we can't use an installed gpg-authcode-sign.sh at least
use a similar version as GnuPG uses to have this in common.