treewide: Remove obsolete image-mklibs class

This is apparently not actually working anymore and is removed in the
next poky update.

Change-Id: Ia1c6a258d124a4a30a14fc42e8e0bba95e64faeb
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-phosphor/conf/local.conf.sample b/meta-phosphor/conf/local.conf.sample
index d77fc8a..0a62163 100644
--- a/meta-phosphor/conf/local.conf.sample
+++ b/meta-phosphor/conf/local.conf.sample
@@ -3,7 +3,7 @@
 PACKAGE_CLASSES ?= "package_rpm"
 SANITY_TESTED_DISTROS_append ?= " *"
 EXTRA_IMAGE_FEATURES = "debug-tweaks"
-USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+USER_CLASSES ?= "buildstats image-prelink"
 PATCHRESOLVE = "noop"
 BB_DISKMON_DIRS = "\
     STOPTASKS,${TMPDIR},1G,100K \