rltiles: add makefile.mac for Mac OS X builds

It deviates enough from the UNIX makefile that it really should be separate.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Created by  Steven Noonan  on September 20, 2009
3SH44HTH4B75EIOLDKY5C4ZMSM4ZXN5H3XAOVK42JWKCJBR256GAC
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