Use PropertyList instead of plutil for increased performance.

Change-Id: I8ff5b11ed06bb2817e47a973d1a8043c5bcd3237
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Detect MinGW on all platforms.

Change-Id: I4e93aadf5b196087942af1b427cfef8d6b7dc72b
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>