Fix OpenMP build with libomp 15+

[hcho3]

Related: dmlc/xgboost#8384

[codecov]

Codecov Report

Base: 84.35% // Head: 84.29% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (c64c823) compared to base (b86063e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff               @@
##             mainline     #410      +/-   ##
==============================================
- Coverage       84.35%   84.29%   -0.06%     
+ Complexity         44       42       -2     
==============================================
  Files             110      110              
  Lines            8769     8769              
  Branches          526      534       +8     
==============================================
- Hits             7397     7392       -5     
- Misses           1348     1354       +6     
+ Partials           24       23       -1     

Impacted Files	Coverage Δ
...src/main/java/ml/dmlc/treelite4j/java/DMatrix.java	55.81% <0.00%> (-13.96%)	⬇️
src/threading_utils/parallel_for.h	62.29% <0.00%> (+1.63%)	⬆️

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