opkg: drop S/MIME support

It has never been used by default (due to being too bloated), and it is
properly replaced by usign (which has been the default for a long time
now).

Remove this feature to simplify the build system

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/base-files/image-config.in

@@ -292,42 +292,3 @@ menuconfig PER_FEED_REPO
 		  Add not enabled feeds as commented out source lines to opkg.conf.
 
 source "tmp/.config-feeds.in"
-
-
-menuconfig SMIMEOPT
-	bool "Package signing options" if IMAGEOPT
-        default n
-	help
-		These options configure the signing key and certificate to
-		be used for signing and verifying packages.
-
-	config OPKGSMIME_CERT
-		string
-		prompt "Path to certificate (PEM certificate format)" if SMIMEOPT
-		help
-		  Path to the certificate to use for signature verification
-
-	config OPKGSMIME_KEY
-		string
-		prompt "Path to signing key (PEM private key format)" if SMIMEOPT
-		help
-		  Path to the key to use for signing packages
-
-	config OPKGSMIME_PASSPHRASE
-		bool
-		default y
-		prompt "Wait for a passphrase when signing packages?" if SMIMEOPT
-		help
-		  If this value is set, then the build will pause and request a passphrase
-                  from the command line when signing packages. This SHOULD NOT be used with
-                  automatic builds. If this value is not set, a file can be specified from
-                  which the passphrase will be read.
-
-	config OPKGSMIME_PASSFILE
-		string
-		prompt "Path to a file containing the passphrase" if SMIMEOPT
-                depends on !OPKGSMIME_PASSPHRASE
-		help
-		  Path to a file containing the passphrase for the signing key.
-                  If the signing key is not encrypted and does not require a passphrase,
-                  this option may be left blank.