python3: Removes pycache.

INCLUDE_PYC = 0 should prevent the python recipe to build pycache.
Because it still produces half the pycache (bug?),
I added a script to find and remove all pycache directories before they are packaged.

BugzID: 53805

Signed-off-by: Lucien Mueller <lucien.mueller@netmodule.com>

recipes-devtools/python/python3_%.bbappend

@@ -1 +1,9 @@
 EXTRA_OECONF_remove = "ac_cv_header_bluetooth_bluetooth_h=no ac_cv_header_bluetooth_h=no"
+
+INCLUDE_PYCS = "0"
+
+PACKAGE_PREPROCESS_FUNCS += "clean_pycache"
+
+clean_pycache(){
+    find ${PKGD} | grep -E "(__pycache__|\.pyc|\.pyo$)" | xargs rm -rf
+}