Change buildspec to allow disabling SVG.

Change-Id: Ia1a8fab6118f39ca10ca8df2254bef5466e54d75
diff --git a/buildspec.mk.default b/buildspec.mk.default
index 6303efc..bc4de4b 100644
--- a/buildspec.mk.default
+++ b/buildspec.mk.default
@@ -106,9 +106,9 @@
 #WEBCORE_INSTRUMENTATION:=true
 endif
 
-# To enable SVG in webcore define ENABLE_SVG:=true
+# To disable SVG in webcore define ENABLE_SVG:=false
 ifndef ENABLE_SVG
-#ENABLE_SVG:=true
+#ENABLE_SVG:=false
 endif
 
 # when the build system changes such that this file must be updated, this