build: correct quoting of args in run.bash

Change-Id: I72df4d979212d8af74a4d2763423346eb6ba14f2
Reviewed-on: https://go-review.googlesource.com/9892Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/run.bash

@@ -35,4 +35,4 @@ if ulimit -T &> /dev/null; then
 	[ "$(ulimit -H -T)" == "unlimited" ] || ulimit -S -T $(ulimit -H -T)
 fi
 
-exec go tool dist test $@
+exec go tool dist test "$@"