Support WITHOUT_CLANG builds

(cherry picked from commit c9f7723cdb39f9791775166ec1942e456086ad3c)

Change-Id: I9443e73a07b81038452c694a2f138faecdeff500
diff --git a/runtime/Android.mk b/runtime/Android.mk
index 18e2d3e..98bec85 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -302,7 +302,7 @@
 
 # $(1): target or host
 # $(2): ndebug or debug
-# 3(3): true or false for LOCAL_CLANG
+# $(3): true or false for LOCAL_CLANG
 define build-libart
   ifneq ($(1),target)
     ifneq ($(1),host)