image/image-prelink/image-mklibs/sanity: Drop pointless EXPORT_FUNCTIONS

I'm sick of seeing people adding to EXPORT_FUNCTIONS in these classes
when they clearly have no idea what it does.

Worse, these uses of it are all broken, the naming is incorrect and
they do nothing. Lets remove them and try and preserve any remaining
part of my sanity.

(From OE-Core rev: 05a2fb19f722652c5d13be911b8ed45a264bbb40)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image-mklibs.bbclass

@@ -69,6 +69,3 @@ mklibs_optimize_image() {
 		fi
 	done
 }
-
-
-EXPORT_FUNCTIONS mklibs_optimize_image

meta/classes/image-prelink.bbclass

@@ -31,5 +31,3 @@ prelink_image () {
 	pre_prelink_size=`du -ks ${IMAGE_ROOTFS} | awk '{size = $1 ; print size }'`
 	echo "Size after prelinking $pre_prelink_size."
 }
-
-EXPORT_FUNCTIONS prelink_image

meta/classes/image.bbclass

@@ -384,8 +384,6 @@ rootfs_sysroot_relativelinks () {
 	sysroot-relativelinks.py ${SDK_OUTPUT}/${SDKTARGETSYSROOT}
 }
 
-EXPORT_FUNCTIONS zap_empty_root_password remove_init_link do_rootfs make_zimage_symlink_relative set_image_autologin rootfs_update_timestamp rootfs_no_x_startup
-
 do_fetch[noexec] = "1"
 do_unpack[noexec] = "1"
 do_patch[noexec] = "1"

meta/classes/sanity.bbclass

@@ -25,8 +25,6 @@ def sanity_conf_update(fn, lines, version_var_name, new_version):
     with open(fn, "w") as f:
         f.write(''.join(lines))
 
-EXPORT_FUNCTIONS bblayers_conf_file sanity_conf_read sanity_conf_find_line sanity_conf_update
-
 # Functions added to this variable MUST throw an exception (or sys.exit()) unless they
 # successfully changed LCONF_VERSION in bblayers.conf
 BBLAYERS_CONF_UPDATE_FUNCS += "oecore_update_bblayers"