X explicit goflags handling is not needed

On can just use GOFLAGS env var that is taken by go command itself into
account.

wcfs/test.sh

@@ -2,15 +2,7 @@
 # run wcfs tests under custom linux kernel
 
 if test -z "$qrun_loglevel"; then
-	# flags for `go build`
-	goflags=""
-	case "$1" in
-		-race)	# enable race-detector
-			goflags="$goflags $1"
-			shift;;
-	esac
-
-	go build $goflags	# rebuild wcfs
+	go build # rebuild wcfs
 	linux=${LINUX:-$HOME/src/linux/linux/arch/`uname -m`/boot/bzImage}
 	exec ../t/qemu-runlinux "$linux" $0 "$@"
 fi