binutils-cross-canadian: Clear BBCLASSEXTEND as a native version of this recipe makes no sense

(From OE-Core rev: 5980cd6af7b5260558cb234288a426c091b5de2a)

(From OE-Core rev: 3611bbe4eb7b851c4d2275e9507785d734651777)

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

meta/recipes-devtools/binutils/binutils-cross-canadian.inc

@@ -20,3 +20,5 @@ do_install () {
 	rm -f ${D}${libdir}/libopcodes*
 	rm -f ${D}${includedir}/*.h
 }
+
+BBCLASSEXTEND = ""