Fix NativeLibLoader on Java 9+

[guozhaochen]

Same issue as reported for XGBoost4j: dmlc/xgboost#4342
This fix copies the fix for xgboost4j: dmlc/xgboost#4351

Testing has been done on Java 11 and Java 17.

[codecov]

Codecov Report

Merging #315 (7a9150d) into mainline (80a7410) will decrease coverage by 0.11%.
The diff coverage is 50.00%.

@@              Coverage Diff               @@
##             mainline     #315      +/-   ##
==============================================
- Coverage       85.15%   85.03%   -0.12%     
+ Complexity         46       43       -3     
==============================================
  Files             108      106       -2     
  Lines            8264     7219    -1045     
  Branches          471       40     -431     
==============================================
- Hits             7037     6139     -898     
+ Misses           1202     1056     -146     
+ Partials           25       24       -1     

Impacted Files	Coverage Δ
.../java/ml/dmlc/treelite4j/java/NativeLibLoader.java	63.63% <50.00%> (+1.87%)	⬆️
python/treelite/libpath.py	75.00% <0.00%> (-7.15%)	⬇️
runtime/python/treelite_runtime/libpath.py	75.00% <0.00%> (-7.15%)	⬇️
src/frontend/xgboost/xgboost_json.h	83.07% <0.00%> (-6.14%)	⬇️
include/treelite/base.h	52.17% <0.00%> (-5.52%)	⬇️
include/treelite/typeinfo.h	85.18% <0.00%> (-4.82%)	⬇️
src/compiler/native/typeinfo_ctypes.h	43.47% <0.00%> (-4.53%)	⬇️
src/compiler/ast/ast.h	34.92% <0.00%> (-3.91%)	⬇️
src/gtil/predict.cc	81.81% <0.00%> (-3.69%)	⬇️
src/threading_utils/parallel_for.h	97.14% <0.00%> (-2.86%)	⬇️
... and 56 more

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[chyunsu3]

Thank you for your contribution!