fix a bug in setup.py

[njzjz]

I got what's wrong here...

[codecov-commenter]

Codecov Report

Merging #1002 (ad5e6e8) into devel (f2a7303) will increase coverage by 7.81%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel    #1002      +/-   ##
==========================================
+ Coverage   75.46%   83.27%   +7.81%     
==========================================
  Files          85      118      +33     
  Lines        6794     9980    +3186     
==========================================
+ Hits         5127     8311    +3184     
- Misses       1667     1669       +2     

Impacted Files	Coverage Δ
source/api_cc/tests/test_deeppot_r.cc	100.00% <0.00%> (ø)
source/lib/tests/test_gelu.cc	100.00% <0.00%> (ø)
source/lib/tests/test_prod_force_grad_r.cc	100.00% <0.00%> (ø)
source/api_cc/tests/test_utils.h	97.22% <0.00%> (ø)
source/lib/tests/test_prod_force_a.cc	100.00% <0.00%> (ø)
source/lib/tests/test_ewald.cc	100.00% <0.00%> (ø)
source/lib/tests/test_main.cc	100.00% <0.00%> (ø)
source/lib/tests/test_prod_virial_a.cc	100.00% <0.00%> (ø)
source/lib/tests/test_prod_force_grad_a.cc	100.00% <0.00%> (ø)
source/lib/tests/test_prod_virial_grad_r.cc	100.00% <0.00%> (ø)
... and 23 more

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