Guard new includes.

samples/0_Intro/hcc_dialects/vadd_hc_array.hc

@@ -20,7 +20,11 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 
-#include <hc/hc.hpp>
+#if defined(HC_NEXT)
+    #include <hc/hc.hpp>
+#else
+    #include <hc.hpp>
+#endif
 
 int main(int argc, char *argv[])
 {