unset MACOSX_DEPLOYMENT_TARGET, rather than sometimes setting a bogus value

[bukzor]

Related:

• macos-11.0: scipy build fails #31326 (removes an instance of MACOSX_DEPLOYMENT_TARGET in build/pkgs/scipy/spkg-install.in) and

• #31204 comment:9 (should we set MACOSX_DEPLOYMENT_TARGET before running doctests?)

• #18254 comment:32 (comment from 2015, not sure if still relevant...)

• bug in notebook (too much text clipped) #38 (also from 2015)

Depends on #31227

CC: @kiwifb

Component: packages: standard

Author: John Palmieri

Branch/Commit: 7581b9c

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/18272

[sagetrac-github-bot]

Branch: u/github/ticket/18272

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

569f12d

unset MACOSX_DEPLOYMENT_TARGET, rather than sometimes setting a bogus value

[sagetrac-git]

Commit: 569f12d

[jhpalmieri]

comment:4

Given [#18254 comment:43], this needs to be at least "needs work", if not "wontfix": it doesn't address the issues at #7095 which resulted in setting MACOSX_DEPLOYMENT_TARGET.

[fchapoton]

comment:5

old stuff, do you agree that this can be closed ?