Move from WITH_ART to PRODUCT_RUNTIMES

Change-Id: I3a9217b4aafc1f59d095169deb9eaeae17320505
diff --git a/core/config.mk b/core/config.mk
index e7ee49f..beb4b31 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -123,7 +123,7 @@
 
 # ---------------------------------------------------------------
 # Try to include buildspec.mk, which will try to set stuff up.
-# If this file doesn't exist, the environemnt variables will
+# If this file doesn't exist, the environment variables will
 # be used, and if that doesn't work, then the default is an
 # arm build
 ifndef ANDROID_BUILDSPEC