apple-gcc42: Add mirror

Fixes #23047.
ENV.x11: always add include/freetype2 to CPPFLAGS
ENV.x11: only use SDK when CLT is missing and X11 is from Apple
superenv: fix hardcoded X11 aclocal path
Check types in Formula#==

Comparing two objects should not raise an exception, even if they have
different types.

The semantics of #== are now the same as #eql?, so make one an alias.
Dart 28108

Upgrade to the latest dart milestone 28108

Closes #23050.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
crosstool-ng 1.19.0

Closes #23015.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
openrtsp 2013.10.03

Closes #23020.
Redact GNU Arch

This project has been removed from GNU mirrors.

Debian still packages a version of it, so users of this software
could switch the formula to use the Debian download, though we
no longer want to carry this in core.
lcrack: use debian
jenkins: add TLS mail support to plist.
jenkins 1.533