make install

Update: I've been meaning to get around to checking on just how bad the problem is in practice (i.e. does it actually affect seeking on small files as well as large ones?) and if there is a workaround to build perl as if large file support wasn't there, but haven't got around to it. Also been meaning to pester Gerrit (the cygwin perl maintainer) and some of the PerlIO gurus to look into it more...but I've been wasting my free time here at perlmonks instead :)