use cheaprandn as Fastrandn for go1.22

logger.go

@@ -2135,9 +2135,3 @@ func absClock(abs uint64) (hour, min, sec int)
 //go:noescape
 //go:linkname callers runtime.callers
 func callers(skip int, pcbuf []uintptr) int
-
-// Fastrandn returns a pseudorandom uint32 in [0,n).
-//
-//go:noescape
-//go:linkname Fastrandn runtime.fastrandn
-func Fastrandn(x uint32) uint32

logger_go1.18.go

@@ -0,0 +1,14 @@
+//go:build go1.18 && !go1.22
+// +build go1.18,!go1.22
+
+package log
+
+import (
+	_ "unsafe"
+)
+
+// Fastrandn returns a pseudorandom uint32 in [0,n).
+//
+//go:noescape
+//go:linkname Fastrandn runtime.fastrandn
+func Fastrandn(x uint32) uint32

logger_go1.22.go

@@ -0,0 +1,14 @@
+//go:build go1.22
+// +build go1.22
+
+package log
+
+import (
+	_ "unsafe"
+)
+
+// Fastrandn returns a pseudorandom uint32 in [0,n).
+//
+//go:noescape
+//go:linkname Fastrandn runtime.cheaprandn
+func Fastrandn(x uint32) uint32