Add our own API desugaring

Fix #8452

app/core/src/main/java/com/topjohnwu/magisk/core/utils/Desugar.java

@@ -0,0 +1,32 @@
+package com.topjohnwu.magisk.core.utils;
+
+import android.os.Build;
+
+import java.nio.file.attribute.FileTime;
+import java.util.zip.ZipEntry;
+
+public class Desugar {
+    public static FileTime getLastModifiedTime(ZipEntry entry) {
+        if (Build.VERSION.SDK_INT >= 26) {
+            return entry.getLastModifiedTime();
+        } else {
+            return FileTime.fromMillis(entry.getTime());
+        }
+    }
+
+    public static FileTime getLastAccessTime(ZipEntry entry) {
+        if (Build.VERSION.SDK_INT >= 26) {
+            return entry.getLastAccessTime();
+        } else {
+            return null;
+        }
+    }
+
+    public static FileTime getCreationTime(ZipEntry entry) {
+        if (Build.VERSION.SDK_INT >= 26) {
+            return entry.getCreationTime();
+        } else {
+            return null;
+        }
+    }
+}