builds/vms/apinames_vms.bash: Fix unzip artifact

The problem occured when unpacking a zip file created on OpenVMS on Linux.
While OpenVMS knows many different file formats, Unix only knows stream-LF
and binary.  In principle `zip` on Linux should have translated the file to
stream-LF but failed to do so.  That caused the file to incorrectly contain
only one line with control-characters.