Added build.type switch to HelloWorld example

Avoiding the build of the experimental cpp HelloWorld example
in stable builds

Change-Id: I4d4f9c0ae353bbe140aed0c7c4dd2479e6b911cc

git-svn-id: https://svn.apache.org/repos/asf/incubator/etch/trunk@1368972 13f79535-47bb-0310-9956-ffa450edef68
1 file changed