'make upgrade' deletes /usr/bin/perl5

[walt <wa1ter@xxxxxxxxxxxxx>]

The glib port installs /usr/local/bin/glib-mkenums, which is a
perl script that depends upon /usr/bin/perl5.

The problem is that 'make upgrade' deletes /usr/bin/perl5, so
any perl script depending on /usr/bin/perl5 will fail.

Could 'make upgrade' include a warning about perl5 instead of
deleting it, perhaps?