[issue11651] Improve test targets in Makefile

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> I propose instead to change 'make quicktest' to use -j(N>1) and blacklist the following tests:
> 
> test_mmap
> test_shelve
> test_posix
> test_largefile
> test_concurrent_futures

Why would you blacklist these tests? They are useful.
I agree with Skip's latest message on python-dev: if you blacklist
things you are removing some coverage.
Do note that the most resource-consuming tests are already enabled only
when -usomething is passed.

> Then (for me) it runs in 3m20s wall clock time which is totally
> reasonable and I think also still useful.  Note that -j is
> incompatible with -l so some refactoring of TESTOPTS will probably be
> required.

In the patch I've removed -l, which I've never seen do anything useful.

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