Don't attempt to set file descriptor limit.

Recent versions of Go do it at startup, so only print
a warning if the limit is too low.

limit/limit.go

@@ -1,7 +1,7 @@
-// +build !linux
+//go:build !unix
 
 package limit
 
-func Nofile(desired uint64) (uint64, error) {
-	return desired, nil
+func Nofile() (uint64, error) {
+	return 0xFFFF, nil
 }