Fix gRPC header include path.

[ChrisCummins]

Strip the include/ directory prefix.

[codecov-commenter]

Codecov Report

Merging #605 (980aa3a) into development (d5d60b6) will decrease coverage by 6.46%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #605      +/-   ##
===============================================
- Coverage        88.26%   81.79%   -6.47%     
===============================================
  Files              114      114              
  Lines             6708     6708              
===============================================
- Hits              5921     5487     -434     
- Misses             787     1221     +434     

Impacted Files	Coverage Δ
...er_gym/third_party/inst2vec/inst2vec_preprocess.py	10.72% <0.00%> (-63.22%)	⬇️
compiler_gym/envs/llvm/compute_observation.py	31.81% <0.00%> (-59.10%)	⬇️
compiler_gym/envs/llvm/datasets/clgen.py	43.28% <0.00%> (-46.27%)	⬇️
compiler_gym/envs/llvm/llvm_benchmark.py	51.09% <0.00%> (-42.34%)	⬇️
compiler_gym/third_party/inst2vec/__init__.py	56.66% <0.00%> (-36.67%)	⬇️
compiler_gym/envs/llvm/datasets/llvm_stress.py	58.33% <0.00%> (-33.34%)	⬇️
compiler_gym/envs/llvm/datasets/chstone.py	51.21% <0.00%> (-31.71%)	⬇️
compiler_gym/envs/llvm/datasets/csmith.py	55.26% <0.00%> (-31.58%)	⬇️
compiler_gym/util/commands.py	54.76% <0.00%> (-30.96%)	⬇️
compiler_gym/validation_result.py	70.00% <0.00%> (-12.86%)	⬇️
... and 13 more

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[hughleat]

LGTM