python: move PYTHON_VERSION in own .mk file

Allows for more granularity with respect to python-host.mk
and python-package.mk inclusions.

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

lang/python/Makefile

@@ -7,10 +7,13 @@
 
 include $(TOPDIR)/rules.mk
 
+# For PYTHON_VERSION
+include ./files/python-version.mk
+
 # This file provides the necsessary host build variables
 include ./files/python-host.mk
 
-# The file included below defines PYTHON_VERSION
+# For PyPackage
 include ./files/python-package.mk
 
 PKG_NAME:=python
@@ -142,6 +145,7 @@ define Build/InstallDev
 	$(INSTALL_DATA) \
 		./files/python-package.mk \
 		./files/python-host.mk \
+		./files/python-version.mk \
 		$(STAGING_DIR)/mk/
 	$(CP) \
 		$(PKG_INSTALL_DIR)/usr/include/python$(PYTHON_VERSION) \

lang/python/files/python-host.mk

@@ -8,6 +8,9 @@
 ifneq ($(__python_host_mk_inc),1)
 __python_host_mk_inc=1
 
+# For PYTHON_VERSION
+$(call include_mk, python-version.mk)
+
 # Compatibility fallback for older OpenWrt and LEDE versions
 ifeq ($(STAGING_DIR_HOSTPKG),)
   $(warning STAGING_DIR_HOSTPKG is unset - falling back to $$(STAGING_DIR)/host)

lang/python/files/python-package.mk

@@ -5,8 +5,7 @@
 # See /LICENSE for more information.
 #
 
-PYTHON_VERSION:=2.7
-PYTHON_VERSION_MICRO:=12
+$(call include_mk, python-version.mk)
 
 PYTHON_DIR:=$(STAGING_DIR)/usr
 PYTHON_BIN_DIR:=$(PYTHON_DIR)/bin

lang/python/files/python-version.mk

@@ -0,0 +1,10 @@
+#
+# Copyright (C) 2016 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+PYTHON_VERSION:=2.7
+PYTHON_VERSION_MICRO:=12
+