python-protobuf: upgrade 3.9.0 -> 3.9.1

Signed-off-by: Yuan Chao <yuanc.fnst@cn.fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-protobuf_3.9.1.bb

@@ -0,0 +1,10 @@
+inherit setuptools3
+require python-protobuf.inc
+
+DEPENDS += "protobuf"
+DISTUTILS_BUILD_ARGS += "--cpp_implementation"
+DISTUTILS_INSTALL_ARGS += "--cpp_implementation"
+
+do_compile_prepend_class-native () {
+    export KOKORO_BUILD_NUMBER="1"
+}