Use the same compilation flags on OS X 10.8 as 10.7

Added Mountain Lion to the list of versions which don't need ranlib
and don't need the pre-Lion linker flags

Change-Id: I0c785f0c66e324af9a209520c5a5b3c9bf7df0d5
Signed-off-by: Al Sutton <al@funkyandroid.com>