mii-tool: fix build on buildbots (fixes #3263)

I think re-ordering the assignments is important here,
_and_ using := for PKG_SOURCE_SUBDIR instead of simple =.

I also grouped the assignments to make it more readable,
IMHO at least :-)

While at, we should also specify the license file
and remove the unneeded Compile definition - the default
just works fine.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

net/mii-tool/Makefile

@@ -10,15 +10,19 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mii-tool
 PKG_VERSION=2016-07-10-$(PKG_SOURCE_VERSION)
-PKG_RELEASE:=2
-PKG_LICENSE:=GPL-2.0
-PKG_MAINTAINER:=Stijn Segers <borromini.reg@protonmail.com>
+PKG_RELEASE:=3
+
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=git://git.code.sf.net/p/net-tools/code
-PKG_SOURCE_SUBDIR=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE_VERSION:=115f1af2494ded1fcd21c8419d5e289bc4df380f
+PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 
+PKG_LICENSE:=GPL-2.0
+PKG_LICENSE_FILES:=COPYING
+
+PKG_MAINTAINER:=Stijn Segers <borromini.reg@protonmail.com>
+
 include $(INCLUDE_DIR)/package.mk
 
 define Package/mii-tool
@@ -41,10 +45,6 @@ define Build/Configure
 	(cd $(PKG_BUILD_DIR) && yes $$$$'\n' | ./configure.sh config.in )
 endef
 
-define Build/Compile
-	$(call Build/Compile/Default,mii-tool)
-endef
-
 define Package/mii-tool/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/mii-tool $(1)/usr/sbin/