core: remove .py/.pyc for Python

The main Buildroot Makefile was removing *.py or *.pyc if Python 2 was
enabled, but for Python 3, this action was taken care of by a post
install target hook of python3.mk, which means it wouldn't work with
external modules (the .py/.pyc removal would be done before external
Python modules are installed).

We fix this by making the global *.py/*.pyc removal in the main
Makefile work for both Python 2 and Python 3.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Makefile

@@ -522,10 +522,10 @@ endif
 	rm -rf $(TARGET_DIR)/usr/doc $(TARGET_DIR)/usr/share/doc
 	rm -rf $(TARGET_DIR)/usr/share/gtk-doc
 	-rmdir $(TARGET_DIR)/usr/share 2>/dev/null
-ifeq ($(BR2_PACKAGE_PYTHON_PY_ONLY),y)
+ifeq ($(BR2_PACKAGE_PYTHON_PY_ONLY)$(BR2_PACKAGE_PYTHON3_PY_ONLY),y)
 	find $(TARGET_DIR)/usr/lib/ -name '*.pyc' -print0 | xargs -0 rm -f
 endif
-ifeq ($(BR2_PACKAGE_PYTHON_PYC_ONLY),y)
+ifeq ($(BR2_PACKAGE_PYTHON_PYC_ONLY)$(BR2_PACKAGE_PYTHON3_PYC_ONLY),y)
 	find $(TARGET_DIR)/usr/lib/ -name '*.py' -print0 | xargs -0 rm -f
 endif
 	rm -rf $(TARGET_DIR)/usr/lib/luarocks