Remove dependency on golang.org/x/sys/unix

(*os.PathError).Timeout does the same thing.

PiperOrigin-RevId: 360756784

pkg/log/BUILD

@@ -18,7 +18,6 @@ go_library(
     deps = [
         "//pkg/linewriter",
         "//pkg/sync",
-        "@org_golang_x_sys//unix:go_default_library",
     ],
 )
 

pkg/log/log.go

@@ -40,7 +40,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/linewriter"
 	"gvisor.dev/gvisor/pkg/sync"
 )
@@ -105,7 +104,7 @@ func (l *Writer) Write(data []byte) (int, error) {
 		n += w
 
 		// Is it a non-blocking socket?
-		if pathErr, ok := err.(*os.PathError); ok && pathErr.Err == unix.EAGAIN {
+		if pathErr, ok := err.(*os.PathError); ok && pathErr.Timeout() {
 			runtime.Gosched()
 			continue
 		}