python-setuptools: use $(PYTHON_PKG_DIR) short-hand

Signed-off-by: Xuefer Tinys <xuefer@gmail.com>
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python-setuptools/Makefile

@@ -44,10 +44,10 @@ define PyPackage/python-setuptools/filespec
 endef
 
 define Build/InstallDev
-	$(INSTALL_DIR) $(2)/lib/python$(PYTHON_VERSION)/site-packages
+	$(INSTALL_DIR) $(2)$(PYTHON_PKG_DIR)
 	$(CP) \
-		$(PKG_INSTALL_DIR)/usr/lib/python$(PYTHON_VERSION)/site-packages/* \
-		$(HOST_PYTHON_LIB_DIR)/site-packages
+		$(PKG_INSTALL_DIR)$(PYTHON_PKG_DIR) \
+		$(2)$(PYTHON_PKG_DIR)
 endef
 
 define PyPackage/python-setuptools/install