python-mako: use pypi.bbclass

* Simpify python3-mako by using pypi.bbclass
* Consolidate common content in .inc

(From OE-Core rev: dac10db1853bae722f35e6aab24569f12df30b55)

Signed-off-by: Tim Orling <timothy.t.orling@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3-mako_1.0.7.bb

@@ -1,11 +1,2 @@
-require python-mako.inc
-
 inherit setuptools3
-
-RDEPENDS_${PN} = "python3-threading \
-                  python3-netclient \
-                  python3-html \
-"
-RDEPENDS_${PN}_class-native = ""
-
-BBCLASSEXTEND = "native nativesdk"
+require python-mako.inc