Export site package directory location for use by other packages

package/python/python.mk

@@ -12,6 +12,7 @@ PYTHON_CAT:=$(BZCAT)
 PYTHON_BINARY:=python
 PYTHON_TARGET_BINARY:=usr/bin/python
 PYTHON_DEPS:=
+PYTHON_SITE_PACKAGE_DIR=$(TARGET_DIR)/usr/lib/python$(PYTHON_VERSION_SHORT)/site-packages
 
 BR2_PYTHON_DISABLED_MODULES=dbm zipfile