Don't call get_sympy_dir() at import time

[asmeurer]

This was causing issues with pyoxidizer because of the use of __file__, but this shouldn't be done at import time anyway.

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Release Notes

• utilities
  • remove sympy_dir variable from sympy.utilities.runtests. Use get_sympy_dir() instead (note that this is not really public API).

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• utilities
  • remove sympy_dir variable from sympy.utilities.runtests. Use get_sympy_dir() instead (note that this is not really public API). (#17180 by @asmeurer)

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<!-- Your title above should be a short description of what
was changed. Do not include the issue number in the title. -->

This was causing issues with pyoxidizer because of the use of `__file__`, but this shouldn't be done at import time anyway. 

#### References to other Issues or PRs
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#### Brief description of what is fixed or changed


#### Other comments


#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
* utilities
  * remove `sympy_dir` variable from `sympy.utilities.runtests`. Use `get_sympy_dir()` instead (note that this is not really public API).
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[codecov]

Codecov Report

Merging #17180 into master will decrease coverage by 0.012%.
The diff coverage is 50%.

@@              Coverage Diff              @@
##            master    #17180       +/-   ##
=============================================
- Coverage   74.521%   74.509%   -0.013%     
=============================================
  Files          623       623               
  Lines       161546    161545        -1     
  Branches     37910     37910               
=============================================
- Hits        120387    120366       -21     
- Misses       35819     35840       +21     
+ Partials      5340      5339        -1

[oscarbenjamin]

I saw a recent post on another mailing list about pyoxidiser. Are you trying to get it to work so SymPy can be a standalone application? Or is this for including SymPy as part of another application?

[asmeurer]

Someone at SciPy mentioned it, and we were looking at it and tested it on SymPy. This was something that caused an issue, and seemed like something that shouldn't be happening anyway, since it slows down the import time. I don't actually have a use-case myself for trying to create an executable from SymPy, although I know others have tried other tools like pyinstaller and it fails (#16865).