make: Move criu version constants from scripts/ to root Makefile

It's nicer to have them there.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile

+VERSION_MAJOR		:= 0
+VERSION_MINOR		:= 3
+VERSION_SUBLEVEL	:=
+VERSION_EXTRA		:=
+VERSION_NAME		:=
+
+export VERSION_MAJOR VERSION_MINOR VERSION_SUBLEVEL VERSION_EXTRA VERSION_NAME
+
 #
 # FIXME zdtm building procedure requires implicit rules
 # so I can't use strict make file mode and drop completely

scripts/Makefile.version

-VERSION_MAJOR		:= 0
-VERSION_MINOR		:= 3
-VERSION_SUBLEVEL	:=
-VERSION_EXTRA		:=
-VERSION_NAME		:=
-
 CRTOOLSVERSION		:= $(VERSION_MAJOR)$(if $(VERSION_MINOR),.$(VERSION_MINOR))$(if $(VERSION_SUBLEVEL),.$(VERSION_SUBLEVEL))
 
-export VERSION_MAJOR VERSION_MINOR
-
 VERSION_HEADER := include/version.h
 
-$(VERSION_HEADER): scripts/Makefile.version
+$(VERSION_HEADER): Makefile scripts/Makefile.version
 	$(E) "  GEN     " $@
 	$(Q) echo "/* Autogenerated, do not edit */"	 		 > $(VERSION_HEADER)
 	$(Q) echo "#ifndef __CR_VERSION_H__"				>> $(VERSION_HEADER)