Update #BACKUP

[RichardWinston]

GExperts uses a "#BACKUP" comment to indicate the names of files that should be included when backing up a project. FastMM4Messages.pas is already included in such a comment. I suggest including FastMM_OSXUtil.pas, FastMM4DataCollector.pas and FastMM4LockFreeStack.pas in such comments too.

{#BACKUP FastMM_OSXUtil.pas}
{#BACKUP FastMM4DataCollector.pas}
{#BACKUP FastMM4LockFreeStack.pas}