docs: remove image-mklibs references

The image-mklibs bbclass was removed from OE-Core with
commit 908df863b419d1cad7317153101fc827e7e3a354 and
corresponding changes to local.conf.sample were made
in meta-yocto with c8c8f284eb2abe7e1352850a885454487cc01986.

Remove all references to image-mklibs from the documentation
as it is no longer supported.

(From yocto-docs rev: f45b378eb2cb08c173620cffb17cbcc8b402da0d)

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/common-tasks.rst

@@ -8002,7 +8002,7 @@ Here is an example of ``image-info.txt``:
 
    DISTRO = poky
    DISTRO_VERSION = 1.7
-   USER_CLASSES = buildstats image-mklibs image-prelink
+   USER_CLASSES = buildstats image-prelink
    IMAGE_CLASSES = image_types
    IMAGE_FEATURES = debug-tweaks
    IMAGE_LINGUAS =

documentation/ref-manual/classes.rst

@@ -932,20 +932,6 @@ specified by :term:`EFI_PROVIDER` if
 Normally, you do not use this class directly. Instead, you add "live" to
 :term:`IMAGE_FSTYPES`.
 
-.. _ref-classes-image-mklibs:
-
-``image-mklibs.bbclass``
-========================
-
-The ``image-mklibs`` class enables the use of the ``mklibs`` utility
-during the :ref:`ref-tasks-rootfs` task, which optimizes
-the size of libraries contained in the image.
-
-By default, the class is enabled in the ``local.conf.template`` using
-the :term:`USER_CLASSES` variable as follows::
-
-   USER_CLASSES ?= "buildstats image-mklibs image-prelink"
-
 .. _ref-classes-image-prelink:
 
 ``image-prelink.bbclass``
@@ -959,7 +945,7 @@ time.
 By default, the class is enabled in the ``local.conf.template`` using
 the :term:`USER_CLASSES` variable as follows::
 
-   USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+   USER_CLASSES ?= "buildstats image-prelink"
 
 .. _ref-classes-insane:
 

documentation/ref-manual/variables.rst

@@ -8502,11 +8502,11 @@ system and gives an overview of their function and contents.
    :term:`USER_CLASSES`
       A list of classes to globally inherit. These classes are used by the
       OpenEmbedded build system to enable extra features (e.g.
-      ``buildstats``, ``image-mklibs``, and so forth).
+      ``buildstats``, ``image-prelink``, and so forth).
 
       The default list is set in your ``local.conf`` file::
 
-         USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+         USER_CLASSES ?= "buildstats image-prelink"
 
       For more information, see
       ``meta-poky/conf/local.conf.sample`` in the :term:`Source Directory`.