multilib: Enable multilib remapping for SDK generation

Enable the remapping for SDK generation, this is required to be able to
create an SDK that targets an alternative multilib.  Note, this work does
not finish SDK/multilib support, but it is one more step toward making
it work properly.

(From OE-Core rev: d66d2bdf6214939e8b131f47db2f35d3c64e7dd2)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/multilib.bbclass

@@ -54,6 +54,12 @@ python __anonymous () {
         d.setVar("LINGUAS_INSTALL", "")
         # FIXME, we need to map this to something, not delete it!
         d.setVar("PACKAGE_INSTALL_ATTEMPTONLY", "")
+
+    if bb.data.inherits_class('populate_sdk_base', d):
+        clsextend.map_depends_variable("TOOLCHAIN_TARGET_TASK")
+        clsextend.map_depends_variable("TOOLCHAIN_TARGET_TASK_ATTEMPTONLY")
+
+    if bb.data.inherits_class('image', d) or bb.data.inherits_class('populate_sdk_base', d):
         return
 
     clsextend.rename_packages()