Log Message:
Update Mac::SystemDirectory to 0.06.

0.06 2011-02-12 16:00
    - Detect correct target Mac OS version in tests (cross-compilation), patch \ 
by Mark Dootson (RT #65573)

0.05 2011-02-02 11:00
    - Use correct macros on Mac OS X 10.5 and 10.5, reported by Mark Dootson (RT \ 
#65366)