Added option to read HIPCC_FLAGS environment variable.

[sigbjobo]

Fix to #1387.

[codecov-commenter]

Codecov Report

Base: 74.86% // Head: 73.91% // Decreases project coverage by -0.95% ⚠️

Coverage data is based on head (f58f522) compared to base (89d0d23).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2269      +/-   ##
==========================================
- Coverage   74.86%   73.91%   -0.95%     
==========================================
  Files         202      182      -20     
  Lines       20011    17059    -2952     
  Branches     1431      939     -492     
==========================================
- Hits        14981    12609    -2372     
+ Misses       4129     3817     -312     
+ Partials      901      633     -268     

Impacted Files	Coverage Δ
deepmd/__main__.py	0.00% <0.00%> (-100.00%)	⬇️
deepmd/descriptor/se_atten.py	11.70% <0.00%> (-81.65%)	⬇️
deepmd/utils/finetune.py	32.00% <0.00%> (-56.00%)	⬇️
source/lib/src/gelu.cc	23.07% <0.00%> (-53.85%)	⬇️
source/lib/src/map_aparam.cc	0.00% <0.00%> (-50.00%)	⬇️
source/lib/src/env_mat.cc	38.32% <0.00%> (-42.52%)	⬇️
deepmd/entrypoints/convert.py	26.66% <0.00%> (-40.00%)	⬇️
deepmd/infer/deep_tensor.py	53.03% <0.00%> (-37.88%)	⬇️
source/op/prod_env_mat_multi_device.cc	69.67% <0.00%> (-24.80%)	⬇️
source/lib/src/fmt_nlist.cc	56.62% <0.00%> (-22.90%)	⬇️
... and 78 more

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[njzjz]

CI failed due to h5py/h5py#2215 - not related to this PR.