local.conf: Drop support for mklibs

This is not enabled or tested by default, and has never been
ported to python 3 upstream[1], which means it doesn't work at all
with plain poky. If you need it, please put it in a separate layer
and/or modernize to work with py3.

https://salsa.debian.org/installer-team/mklibs/-/blob/master/src/mklibs

(From meta-yocto rev: c8c8f284eb2abe7e1352850a885454487cc01986)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/local.conf.sample

@@ -148,11 +148,8 @@ EXTRA_IMAGE_FEATURES ?= "debug-tweaks"
 # enable extra features. Some available options which can be included in this variable
 # are:
 #   - 'buildstats' collect build statistics
-#   - 'image-mklibs' to reduce shared library files size for an image
 #   - 'image-prelink' in order to prelink the filesystem image
-# NOTE: if listing mklibs & prelink both, then make sure mklibs is before prelink
-# NOTE: mklibs also needs to be explicitly enabled for a given image, see local.conf.extended
-USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+USER_CLASSES ?= "buildstats image-prelink"
 
 #
 # Runtime testing of images

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

@@ -119,15 +119,6 @@ DISTRO_FEATURES_remove = "x11"
 #
 # TCMODE ?= "external-sourcery"
 
-# mklibs library size optimization is more useful to smaller images,
-# and less useful for bigger images. Also mklibs library optimization
-# can break the ABI compatibility, so should not be applied to the
-# images which are to be extended or upgraded later.
-#This enabled mklibs library size optimization just for the specified image.
-#MKLIBS_OPTIMIZED_IMAGES ?= "core-image-minimal"
-#This enable mklibs library size optimization will be for all the images.
-#MKLIBS_OPTIMIZED_IMAGES ?= "all"
-
 # This value is currently used by pseudo to determine if the recipe should
 # build both the 32-bit and 64-bit wrapper libraries on a 64-bit build system.
 #