Fix new MinGW problems after raising c++ standard

plugins/vst/SfizzFileScan.cpp

@@ -11,6 +11,9 @@
 #include <absl/strings/ascii.h>
 #include <absl/algorithm/container.h>
 #include <memory>
+#if defined(_WIN32)
+#include <windows.h>
+#endif
 
 // wait at least this much before refreshing the file rescan
 // it permits to not repeat the operation many times if many searches are

plugins/vst/SfizzSettings.cpp

@@ -5,6 +5,7 @@
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
 #include "SfizzSettings.h"
+#include <memory>
 #include <cstdlib>
 
 std::string SfizzSettings::load_or(const char* key, absl::string_view defaultValue)