Adding the PDF rendering library to the build

Change-Id: I4e77d60154e8a6c9d1ceba0224d8710e36e56193
diff --git a/target/product/base.mk b/target/product/base.mk
index 45dd9a7..515bb0c 100644
--- a/target/product/base.mk
+++ b/target/product/base.mk
@@ -60,6 +60,7 @@
     libmtp \
     libnetlink \
     libnetutils \
+    libpdfrenderer \
     libreference-ril \
     libreverbwrapper \
     libril \