Allow out-of-tree builds

Change-Id: If4b97e65f63c3abbf23140dd97b9febe00b3be0d
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/groupext.cpp b/groupext.cpp
index 92edd04..ba43794 100644
--- a/groupext.cpp
+++ b/groupext.cpp
@@ -1,4 +1,4 @@
-#include "ipmid-api.h"
+#include "host-ipmid/ipmid-api.h"
 #include "ipmid.hpp"
 #include <stdio.h>
 #include <stdint.h>