[bug#41574] gnu: Add xed.

[elaexuotee]

This patch packages up Intel's X86 Encoder and Decoder library and associated
cli tool "examples."

A few things of note:

1) The build uses Intel's custom Python build tool `mbuild' so we have to
   manually handle the main build phases. We may need to add explicit options
   to the build script invocation so that build variables (e.g. CFLAGS etc.)
   propogate correctly. These don't look to be set in the environment, so what
   variables should we pick be picking up and from where?

2) The group of tests under `tests/tests-avx512pf' seems to be failing. A user
   on the irc channel also cross-checked for me and confirmed the same. This
   program isn't actually *executing* the avx instructions, so I don't think
   the failing test are specific to the executing cpu. Anyway, I opted to leave
   this test in the source commented out.

3) The commands provided by the `out' output are pretty poorly documented and
   have dumb names. I suspose this is becase the utilities are branded as just
   "examples" of using the library. Anyway, this is a case where the only
   reasonable documentation is the source code, so I provide that for the
   utilities in the `doc' output.

4) Finally, the `devel' output supplies the library and headers proper.

5) The package name `xed' potentially collides with the package from
   http://xed.sourceforge.net/. We don't currently have the latter yet, but I
   mention this just in case there is a good way to proactively handle this up
   front.

Thoughts? I threw this together just because I wanted it myself but figured
it's worth sharing.

0001-gnu-Add-xed.patch
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