add blank line between cmake.h header include to prevent sorting

* add required comment in the line below cmake.h include header

test/variant_partial.test.cpp

@@ -25,6 +25,8 @@
 ////////////////////////////////////////////////////////////////////////////////
 
 #include <cmake.h>
+// cmake.h include header must come first
+
 #include <iostream>
 #include <test.h>
 #include <Variant.h>