Fix bad headers when used from C++ (#43)

* Fix bad headers when used from C++

Tested compilation with both gcc (using the Makefile) and clang
(which is needed to compile the code into an enclave usable
with the Open Enclave SDK).

Signed-off-by: Dave Thaler <dthaler@microsoft.com>

* Same fix for qcbor_decode.h

Signed-off-by: Dave Thaler <dthaler@microsoft.com>
diff --git a/inc/qcbor/qcbor_encode.h b/inc/qcbor/qcbor_encode.h
index 83c8bbf..31fda52 100644
--- a/inc/qcbor/qcbor_encode.h
+++ b/inc/qcbor/qcbor_encode.h
@@ -42,7 +42,7 @@
 
 #ifdef __cplusplus
 extern "C" {
-#ifdef 0
+#if 0
 } // Keep editor indention formatting happy
 #endif
 #endif