Add DESTDIR and Cygwin support for mcqd

[embray]

Implements #24024 + #22509 for the optional package mcqd.

Component: packages: optional

Keywords: destdir mcqd

Author: Erik Bray

Branch/Commit: 33ae2be

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/29148

[embray]

Author: Erik Bray

[embray]

Commit: f4920fd

[embray]

Branch: u/embray/build/destdir-mcqd

[embray]

New commits:

f4920fd

Trac #29148: DESTDIR support for mcqd

[mkoeppe]

Changed branch from u/embray/build/destdir-mcqd to u/mkoeppe/build/destdir-mcqd

[mkoeppe]

Reviewer: Matthias Koeppe

[mkoeppe]

Changed commit from f4920fd to 33ae2be

[mkoeppe]

comment:4

Installs OK on macOS.

---

New commits:

33ae2be

Trac #29148: DESTDIR support for mcqd

[mkoeppe]

comment:5

(rebased on 9.1.beta3)

[vbraun]

Changed branch from u/mkoeppe/build/destdir-mcqd to 33ae2be