mtr 0.85 (and fix 10.9)

Closes #23659.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
sphinx 2.1.2

Closes #23870.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
python_dependency: fix includes location on 10.9.

Fixes #23837.
Fixes #23866.
New patch implementation and DSL

This commit introduces a new patch implementation that supports
checksums and caching.

Patches are declared in blocks:

  patch do
    url ...
    sha1 ...
  end

A strip level of -p1 is assumed. It can be overridden using a symbol
argument:

  patch :p0 do
    url ...
    sha1 ...
  end

Patches can be declared in stable, devel, and head blocks. This form is
preferred over using conditionals.

  stable do
    # ...

    patch do
      url ...
      sha1 ...
    end
  end

Embedded (__END__) patches are declared like so:

  patch :DATA
  patch :p0, :DATA

Patches can also be embedded by passing a string. This makes it possible
to provide multiple embedded patches while making only some of them
conditional.

  patch :p0, "..."
Enable new patch implementation with compatibility layer
fetch: download external patches
audit: check new and old style patches
glib: use patch DSL