Revert^2 "Remove libmdnssd"

This reverts commit 7a31b442274f1ce1fdc93d0a2311b3906cb9a59c.

Reason for revert: relanding

Change-Id: I3a5758c83ce979f591042488f58fb2bacdf9aa23
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 22284b1..42cfc9a 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -172,7 +172,6 @@
     libjpeg \
     liblog \
     libm.bootstrap \
-    libmdnssd \
     libmedia \
     libmedia_jni \
     libmediandk \