local.conf.sample.extended: drop RPM4 example

We don't have RPM4 support anymore, so there's no point including this.

(From meta-yocto rev: 81fc11e65c4fb189cc91422018aec5041f44ae02)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/local.conf.sample.extended

@@ -371,16 +371,6 @@
 #IPK_HIERARCHICAL_FEED = "1"
 #
 
-# Using RPM4
-#
-# Currently the rootfs_rpm code has a hard depends on rpmresolve:do_populate_sysroot,
-# when using rpm4 the rpmresolve code will not compile due to a missing header file.
-# That dependency needs to be removed when using RPM4, also the PREFERRED_VERSION needs
-# to be set. This example shows how to enable rpm4
-# PREFERRED_VERSION_rpm = "4.11.2"
-# PREFERRED_VERSION_rpm-native = "4.11.2"
-# RPMROOTFSDEPENDS_remove = "rpmresolve-native:do_populate_sysroot"
-
 #
 # Use busybox/mdev for system initialization
 #