packagegroup-core-buildessential: Mark as TUNE_PKGARCH specific

The libstdc++ dependency is debian renamed so this shouldn't be allarch,
mark accordingly.

(From OE-Core rev: ac6ec1979caa4032b710eb6f6523bcca29d42cd4)

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

meta/recipes-core/packagegroups/packagegroup-core-buildessential.bb

@@ -5,6 +5,9 @@
 
 SUMMARY = "Essential build dependencies"
 
+# libstdc++ gets debian renamed
+PACKAGE_ARCH = "${TUNE_PKGARCH}"
+
 inherit packagegroup
 
 RDEPENDS:packagegroup-core-buildessential = "\