Fix minizip library compilation under OS X
Fix minizip library compilation under OS X

Set the USE_FILE32API flag on Mac since fopen64()
and several related calls do not exist on that platform which
uses 64bit I/O in the standard file methods.

See http://stackoverflow.com/questions/4003479/how-to-enable-large-file-support-under-darwin
for details.

zhengw1985/Update-Installer,zhengw1985/Update-Installer,zhengw1985/Update-Installer