MINOR: uri_normalizer: Add uri_normalizer module

This is in preparation for future patches.
diff --git a/Makefile b/Makefile
index 607d484..f80ba4b 100644
--- a/Makefile
+++ b/Makefile
@@ -889,7 +889,7 @@
         src/hpack-enc.o src/hpack-huff.o src/ebtree.o src/base64.o             \
         src/hash.o src/dgram.o src/version.o src/fix.o src/mqtt.o src/dns.o    \
         src/server_state.o src/proto_uxdg.o src/init.o src/cfgdiag.o           \
-        src/mjson.o
+        src/mjson.o src/uri_normalizer.o
 
 ifneq ($(TRACE),)
 OBJS += src/calltrace.o