mu 0.9.8.4, adjust head, fix for xapian + emacs

* Upgrade mu to 0.9.8.4
* Use the new head url at GitHub
* Add conditional deps on automake+libtool for autoreconf
* Add `autoreconf -ivf` for building head
* Add a Requirement for emacs >= version 23
* Patch configure error when using Xapian-1.2.10

The mu developers moved their repo from Gitorious to GitHub.

The previous version of mu compiled without problems using the
Lion system `emacs`.  This version uses a command that is not
available in the system emacs-22.1.1, and the compile will fail
using clang or llvm with many errors like this:

    In toplevel form:
    mu4e-actions.el:30:1:Error: Unknown keyword :safe

So this commit adds a Requirement for emacs >= version 23.

For building head add conditional deps on automake and libtool.
Also add the `autoreconf -ivf` system command for head.

Stable fails to configure against xapian-1.2.10 because it only
tests for version 1.2.[0-9].  Patch configure to support the
latest xapian.  Add comments referring to the upstream bug report,
patch, and removal version.  The issue has been fixed in HEAD.

Tested against the new xapian-1.2.10 on Lion 10.7.4 using clang
and llvm from XCode-4.3.2, both stable and HEAD.

Closes #12167.

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

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