meta-oe: Drop broken BBCLASSEXTEND variants

The command "bitbake universe -c fetch" currently throws a ton of warnings
as there are many 'impossible' dependencies.

In some cases these variants may never have worked and were just added by copy
and paste of recipes. In some cases they once clearly did work but became
broken somewhere along the way. Users may also be carrying local bbappend files
which add further BBCLASSEXTEND.

Having universe fetch work without warnings is desireable so clean up the broken
variants. Anyone actually needing something dropped here can propose adding it
and the correct functional dependencies back quite easily. This also then
ensures we're not carrying or fixing things nobody uses.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit 9962d57f7c)
Backport:
* Updated paths to follow PV changes
* Adapted modified recipes to the ones generating warnings
* NB: cups-filter needs poppler-native but its not available. To fix
  this, 5fa0188b8c could be backported.
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-devtools/nanopb/nanopb_0.4.0.bb

@@ -25,6 +25,6 @@ RDEPENDS_${PN} += "\
    protobuf-compiler \
 "
 
-BBCLASSEXTEND = "native nativesdk"
+BBCLASSEXTEND = "nativesdk"
 
 PNBLACKLIST[nanopb] = "Needs forward porting to use python3"