remove api_cc/include/custom_op.h

[njzjz]

This file is duplicate of op/custom_op.h. It's not used by files outside the op directory.

[codecov-commenter]

Codecov Report

Merging #1405 (c746bb7) into devel (0d30288) will increase coverage by 1.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel    #1405      +/-   ##
==========================================
+ Coverage   74.42%   75.63%   +1.21%     
==========================================
  Files          92       92              
  Lines        7507     7531      +24     
==========================================
+ Hits         5587     5696     +109     
+ Misses       1920     1835      -85     

Impacted Files	Coverage Δ
source/op/_tabulate_grad.py	100.00% <0.00%> (ø)
source/op/_prod_force_grad.py	100.00% <0.00%> (ø)
source/op/_prod_virial_grad.py	100.00% <0.00%> (ø)
source/op/_soft_min_force_grad.py	100.00% <0.00%> (ø)
source/op/_prod_force_se_a_grad.py	100.00% <0.00%> (ø)
source/op/_prod_force_se_r_grad.py	100.00% <0.00%> (ø)
source/op/_soft_min_virial_grad.py	100.00% <0.00%> (ø)
source/op/_prod_virial_se_a_grad.py	100.00% <0.00%> (ø)
source/op/_prod_virial_se_r_grad.py	100.00% <0.00%> (ø)
deepmd/utils/argcheck.py	90.22% <0.00%> (+0.19%)	⬆️
... and 6 more

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