Fix build errors and warnings

source/packaging/ext_list.cpp

@@ -72,7 +72,6 @@ void ext_list::ext::serialise(xml::serializer &serialiser)
 {
     std::istringstream ser(serialised_value_);
     xml::parser p(ser, "", xml::parser::receive_default);
-    int nest_level = 0;
     roundtrip(p, serialiser);
 }
 

source/worksheet/phonetic_pr.cpp

@@ -21,7 +21,7 @@
 // @license: http://www.opensource.org/licenses/mit-license.php
 // @author: see AUTHORS file
 
-#include "phonetic_pr.hpp"
+#include <xlnt/worksheet/phonetic_pr.hpp>
 #include <array>
 namespace {
 // Order of elements defined by phonetic_pr::Type enum