emacs: add optional mailutils dependency

The Homebrew Mailutils is more powerful than the version which comes
with Emacs.  This option allows the user to install Homebrew's version
instead.

Closes #31219.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
node 0.10.30

Closes #31273.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
node: update 0.10.30 bottle.
gcc: remove with-profiled-build option

It doesn't work, inside or outside of Homebrew. The option is still
available in the homebrew-versions gcc, though.

Closes #31261.
libxml2: fix opportunistic linking against liblzma

Fixes #30126.