Explicitly pass the full path to the input file to sed. This unbreaks

the WITHOUT_BMAKE build.

Approved by:	re (gjb)

libexec/freebsd-version/Makefile

@@ -7,7 +7,7 @@ CLEANFILES = freebsd-version.sh
 NEWVERS = ${.CURDIR}/../../sys/conf/newvers.sh
 
 freebsd-version.sh.in: ${NEWVERS}
-freebsd-version.sh: freebsd-version.sh.in
+freebsd-version.sh: ${.CURDIR}/freebsd-version.sh.in
 	eval $$(egrep '^(TYPE|REVISION|BRANCH)=' ${NEWVERS}) ; \
 	if ! sed -e "\
 			s/@@TYPE@@/$${TYPE}/g; \