utils: make buffer_write_to_filename overwrite instead of append to existing files
utils: make buffer_write_to_filename overwrite instead of append to existing files

libimobiledevice/libimobiledevice,upbit/libimobiledevice,libimobiledevice-win32/libimobiledevice,libimobiledevice-win32/libimobiledevice,Tatsh/libimobiledevice,patweb/libimobiledevice,patweb/libimobiledevice,Tatsh/libimobiledevice,upbit/libimobiledevice,libimobiledevice-win32/libimobiledevice,Tatsh/libimobiledevice,kalev/libimobiledevice,libimobiledevice-win32/libimobiledevice,libimobiledevice/libimobiledevice,kalev/libimobiledevice,kalev/libimobiledevice,Tatsh/libimobiledevice,patweb/libimobiledevice,upbit/libimobiledevice