tap: change core formula tap naming.
update: rewrite origin to point to Homebrew org.
doctor: check for migrated origin Git remote.

Closes #25211.
CLT.version: check 10.9 CLT first

10.9 users might have older CLT receipts sitting around, which could
result in bad pkgutil results. For example, before changing this, my
`brew --config` was printing '1.0' (the 10.7 version) instead of
'5.0.1.0.1.1382131676', the actual CLT I had installed.
xpa: fix checksum

Closes #25217.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
mapserver: update to 6.4 and new cmake build