MFH: r482594 r483150 r483905 r484631 r485184
Add MANIFEST files for 12.0-BETA1.
Add MANIFEST files for 12.0-BETA2.
Add 12.0-BETA3 MANIFEST files
Add 12.0-BETA4 MANIFEST files.
Prune 12.0-BETA1 and 12.0-BETA2 MANIFESTs.
Add MANIFEST files for 12.0-RC1.
Approved by: portmgr (implicit, re blanket)
Sponsored by: The FreeBSD Foundation