native: Drop special variable handling

Back when it was merged in https://git.yoctoproject.org/poky/commit/?id=c4257ed8b1040a5a0e9a95846d81961741239116
it appeared special handling in setVar was necessary. Likely due to
other fixes and improvements it no longer appears to be. The results of
"bitbake world -g" before and after this change are identical for oe-core
and meta-openembedded. Therefore drop the "parsing=True" special parameter to
setVar() meaning overrides can now be cleared.

This means that something like:

DEPENDS:append = " bash"

now functions as expected, adding bash to the target recipe and bash-native to
the native BBCLASSEXTENDED version.

Without this change, it would add bash to the native version as well as
bash-native which is clearly incorrect.

[YOCTO #15010]

(From OE-Core rev: 47a2634831f907d83ec40ad010351c923ef67f0d)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 99a5105f7b5303cd36077b5910c662a865c1782c)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/native.bbclass

@@ -153,7 +153,7 @@ python native_virtclass_handler () {
                 newdeps.append(dep.replace(pn, bpn) + "-native")
             else:
                 newdeps.append(dep)
-        d.setVar(varname, " ".join(newdeps), parsing=True)
+        d.setVar(varname, " ".join(newdeps))
 
     map_dependencies("DEPENDS", e.data, selfref=False)
     for pkg in e.data.getVar("PACKAGES", False).split():