python3: provide a PYTHON3_PATH

The Python package infrastructure will need the Python 3 package to
provide a PYTHON3_PATH environment variable in order to build
third-party Python modules.

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

package/python3/python3.mk

@@ -147,5 +147,8 @@ endef
 
 HOST_PYTHON3_POST_INSTALL_HOOKS += HOST_PYTHON3_INSTALL_SYMLINK
 
+# Provided to other packages
+PYTHON3_PATH = $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/sysconfigdata/:$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages/
+
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))