runtime: add calls to initRand() during run() for all schedulers.

Intended to ensure that the random number seed used is always initialized on startup.

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/runtime/scheduler_cores.go

@@ -136,6 +136,7 @@ func sleep(duration int64) {
 // other cores when ready.
 func run() {
 	initHeap()
+	initRand()
 
 	go func() {
 		// Package initializers are currently run single-threaded.

src/runtime/scheduler_threads.go

@@ -22,6 +22,7 @@ var (
 // can just initialize everything and run main.main on the main thread.
 func run() {
 	initHeap()
+	initRand()
 	task.Init(stackTop)
 	initAll()
 	callMain()