md: changed Makefile-MacOS to allow overriding the SDK version from the command line.
md: changed Makefile-MacOS to allow overriding the SDK version from the command line.


git-svn-id: 7f544ed0e328361b50b4f1029442fceabdea9cfc@402 a91246af-f21b-0410-bd1c-c3c7fc455132

mbert/mulberry-main,mbert/mulberry-main,mbert/mulberry-main,gpreviato/Mulberry-Mail,mbert/mulberry-main,mbert/mulberry-main,gpreviato/Mulberry-Mail,mbert/mulberry-main,gpreviato/Mulberry-Mail,gpreviato/Mulberry-Mail,mbert/mulberry-main,gpreviato/Mulberry-Mail,mbert/mulberry-main,gpreviato/Mulberry-Mail