Fix build

Move constructor definition to .cpp file to
avoid it being inlined

Change-Id: I1c55095e5158740526af9e698c978abf33304e52
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/fileutils.cpp

@@ -395,6 +395,8 @@ FileSaverBase::FileSaverBase()
 {
 }
 
+FileSaverBase::~FileSaverBase() = default;
+
 bool FileSaverBase::finalize()
 {
     m_file->close();