Add dontwarn to desugar_jdk_libs.json

Bug: 180682492
Change-Id: Ia8e540a261f5d3d1a8ae3fc34e9660c98b955f4c
diff --git a/src/library_desugar/desugar_jdk_libs.json b/src/library_desugar/desugar_jdk_libs.json
index 0ba3777..a859aa1 100644
--- a/src/library_desugar/desugar_jdk_libs.json
+++ b/src/library_desugar/desugar_jdk_libs.json
@@ -251,6 +251,7 @@
     "-keepclassmembers class j$.util.DoubleSummaryStatistics { long count; double sum; double min; double max; }",
     "-keepattributes Signature",
     "-keepattributes EnclosingMethod",
-    "-keepattributes InnerClasses"
+    "-keepattributes InnerClasses",
+    "-dontwarn sun.misc.Unsafe"
   ]
 }