python3-pybind11: extend to native and nativesdk

Extend this recipe with native and nativesdk classes to be able to
provide a package in SDK and run on the build system.

Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Acked-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-pybind11_2.5.0.bb

@@ -32,3 +32,5 @@ do_install() {
 	distutils3_do_install
 	cmake_do_install
 }
+
+BBCLASSEXTEND = "native nativesdk"