vendor: update buildkit to master@d5c1d785b042

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/Microsoft/hcsshim/osversion/osversion_windows.go

@@ -0,0 +1,59 @@
+package osversion
+
+import (
+	"fmt"
+	"sync"
+
+	"golang.org/x/sys/windows"
+)
+
+// OSVersion is a wrapper for Windows version information
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724439(v=vs.85).aspx
+type OSVersion struct {
+	Version      uint32
+	MajorVersion uint8
+	MinorVersion uint8
+	Build        uint16
+}
+
+var (
+	osv  OSVersion
+	once sync.Once
+)
+
+// Get gets the operating system version on Windows.
+// The calling application must be manifested to get the correct version information.
+func Get() OSVersion {
+	once.Do(func() {
+		var err error
+		osv = OSVersion{}
+		osv.Version, err = windows.GetVersion()
+		if err != nil {
+			// GetVersion never fails.
+			panic(err)
+		}
+		osv.MajorVersion = uint8(osv.Version & 0xFF)
+		osv.MinorVersion = uint8(osv.Version >> 8 & 0xFF)
+		osv.Build = uint16(osv.Version >> 16)
+	})
+	return osv
+}
+
+// Build gets the build-number on Windows
+// The calling application must be manifested to get the correct version information.
+func Build() uint16 {
+	return Get().Build
+}
+
+// String returns the OSVersion formatted as a string. It implements the
+// [fmt.Stringer] interface.
+func (osv OSVersion) String() string {
+	return fmt.Sprintf("%d.%d.%d", osv.MajorVersion, osv.MinorVersion, osv.Build)
+}
+
+// ToString returns the OSVersion formatted as a string.
+//
+// Deprecated: use [OSVersion.String].
+func (osv OSVersion) ToString() string {
+	return osv.String()
+}