tools/flock: add PKG_{VERSION,RELEASE}

The stored source code of flock contains the version string of version
2.18, reflect that in the Makefile.

Motivation is the tracking of changes in the buildsystem, which requires
versioning of packages.

Signed-off-by: Paul Spooren <mail@aparcar.org>

tools/flock/Makefile

@@ -7,6 +7,8 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME := flock
+PKG_VERSION := 2.18
+PKG_RELEASE := 1
 
 include $(INCLUDE_DIR)/host-build.mk