Log message:
djbware: reduce lint, mostly by replacing SUBST_CLASSES+=djberrno with
DJB_ERRNO_FIXUP.
While here, sprinkle FORCE_C_STD (mostly c89) where it doesn't break the
build. Tested on NetBSD and macOS.

Log message:
fastforward: remove MESSAGE. Bump PKGREVISION.

Log message:
mail: Replace RMD160 checksums with BLAKE2s checksums
All checksums have been double-checked against existing RMD160 and
SHA512 hashes
The following distfiles were unfetchable (possibly fetched
conditionally?):
./mail/qmail/distinfo netqmail-1.05-TAI-leapsecs.patch

Log message:
mail: Remove SHA1 hashes for distfiles

Log message:
Remove DJB_RESTRICTED, no longer used.

Log message:
Assign non-default SUBST_FILES.djberrno with =, not += (because it
doesn't actually append).

Log message:
Retire 'djbware-errno-hack' and associated options.mk cleverness.
Instead:
1. Package makefiles including their own options.mk
2. Packages say "SUBST_CLASSES+=djberrno" to get the hack, if needed
3. Packages adjust SUBST_FILES.djberrno, if needed
Should fix bulk build failures due to multiple inclusions of options.mk
and/or incorrect definitions of DJB_ERRNO_HACK.
Approved during the freeze by wiz@.

Log message:
all: migrate homepages from http to https
pkglint -r --network --only "migrate"
As a side-effect of migrating the homepages, pkglint also fixed a few
indentations in unrelated lines. These and the new homepages have been
checked manually.