[op] Replace syscall package usage with golang.org/x/sys/unix in pkg/.

The syscall package has been deprecated in favor of golang.org/x/sys.

Note that syscall is still used in the following places:
- pkg/sentry/socket/hostinet/stack.go: some netlink related functionalities
  are not yet available in golang.org/x/sys.
- syscall.Stat_t is still used in some places because os.FileInfo.Sys() still
  returns it and not unix.Stat_t.

Updates #214

PiperOrigin-RevId: 360701387

2 files changed, 5 insertions, 3 deletions

diff --git a/pkg/cpuid/BUILD b/pkg/cpuid/BUILD
index d6cb1a549..c0c864902 100644
--- a/pkg/cpuid/BUILD
+++ b/pkg/cpuid/BUILD
@@ -32,4 +32,5 @@ go_test(
     ],
     library = ":cpuid",
     tags = ["manual"],
+    deps = ["@org_golang_x_sys//unix:go_default_library"],
 )
diff --git a/pkg/cpuid/cpuid_parse_x86_test.go b/pkg/cpuid/cpuid_parse_x86_test.go
index e4ae0d689..d60fdb550 100644
--- a/pkg/cpuid/cpuid_parse_x86_test.go
+++ b/pkg/cpuid/cpuid_parse_x86_test.go
@@ -22,13 +22,14 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
-	"syscall"
 	"testing"
+
+	"golang.org/x/sys/unix"
 )
 
 func kernelVersion() (int, int, error) {
-	var u syscall.Utsname
-	if err := syscall.Uname(&u); err != nil {
+	var u unix.Utsname
+	if err := unix.Uname(&u); err != nil {
 		return 0, 0, err
 	}