python3-gpt-image: Add native and nativesdk targets to the build

Add the native and nativesdk to the recipe.

Signed-off-by: Libo Chen <libo.chen.cn@windriver.com>
Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-python/recipes-extended/python3-gpt-image/python3-gpt-image_0.9.0.bb

@@ -28,3 +28,5 @@ RDEPENDS:${PN}-ptest += " \
 do_install:append() {
 	rm -fr ${D}${libdir}/python*/site-packages/gpt-image/__pycache__
 }
+
+BBCLASSEXTEND = "native nativesdk"