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.
drop support for defining options as a method

Conflicts:
	Library/Homebrew/formula.rb
move management of options collection to the spec object
delegate options to the active spec, stop using build
remove mutation, we need to externalize this state
remove args writer
remove enumeration capabilities
remove the options reader
deep copy is no longer needed