Source json.h non-locally.

Change-Id: Ia42c41fde74596b394a1f7ae0021f1a5510991a8
diff --git a/cli-app/cper-convert.c b/cli-app/cper-convert.c
index b9ac711..86a6d6f 100644
--- a/cli-app/cper-convert.c
+++ b/cli-app/cper-convert.c
@@ -9,7 +9,7 @@
 #include <string.h>
 #include <libgen.h>
 #include <limits.h>
-#include "json.h"
+#include <json.h>
 #include "../cper-parse.h"
 #include "../json-schema.h"