Add module_serializer.cc to libbreakpad.a. Not sure why it wasn't there in the first place. Trivial patch, landing without review.

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@759 4c0a9323-5329-0410-9bdc-e9ce6186880e
diff --git a/Makefile.am b/Makefile.am
index 4eefc88..6c76ab6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -129,6 +129,8 @@
 	src/processor/module_comparer.cc \
 	src/processor/module_comparer.h \
 	src/processor/module_factory.h \
+	src/processor/module_serializer.cc \
+	src/processor/module_serializer.h \
 	src/processor/network_interface.h \
 	src/processor/network_source_line_resolver.cc \
 	src/processor/network_source_line_server.cc \