Add desugar_deploy.jar to third_party.

Bug:
Change-Id: I3630cf107cf661f1ea4d0b8326f32525ca654c69
diff --git a/third_party/desugar/desugar_20180308.tar.gz.sha1 b/third_party/desugar/desugar_20180308.tar.gz.sha1
new file mode 100644
index 0000000..bc15c22
--- /dev/null
+++ b/third_party/desugar/desugar_20180308.tar.gz.sha1
@@ -0,0 +1 @@
+e31fb39c34a94592056e878462f086ffb922d1d0
\ No newline at end of file