Clean up JDK-8 related code

[reta]

Signed-off-by: Andriy Redko drreta@gmail.com

Clean up JDK-8 related code.
Fixes #2879

Checklist

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[codecov-commenter]

Codecov Report

Base: 83.69% // Head: 85.81% // Increases project coverage by +2.11% 🎉

Coverage data is based on head (b196998) compared to base (91223f8).
Patch coverage: 90.47% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2883      +/-   ##
============================================
+ Coverage     83.69%   85.81%   +2.11%     
+ Complexity     2861     2844      -17     
============================================
  Files           327      324       -3     
  Lines          8785     8601     -184     
  Branches       1068     1059       -9     
============================================
+ Hits           7353     7381      +28     
+ Misses         1155      947     -208     
+ Partials        277      273       -4     

Impacted Files	Coverage Δ
...on/bytebuddy/InlineDelegateByteBuddyMockMaker.java	77.56% <ø> (+0.63%)	⬆️
...creation/bytebuddy/SubclassByteBuddyMockMaker.java	52.11% <ø> (+2.11%)	⬆️
.../main/java/org/mockito/internal/util/Platform.java	72.72% <ø> (-4.20%)	⬇️
...al/stubbing/defaultanswers/ReturnsEmptyValues.java	96.96% <90.00%> (ø)
...rg/mockito/internal/debugging/LocationFactory.java	100.00% <100.00%> (+33.33%)	⬆️
.../internal/creation/bytebuddy/MockMethodAdvice.java	81.94% <0.00%> (+0.28%)	⬆️
...l/stubbing/answers/AnswerFunctionalInterfaces.java	94.79% <0.00%> (+1.04%)	⬆️
.../creation/bytebuddy/SubclassBytecodeGenerator.java	69.18% <0.00%> (+2.90%)	⬆️
...rnal/creation/bytebuddy/MockMethodInterceptor.java	77.77% <0.00%> (+7.40%)	⬆️
...ckito/internal/creation/bytebuddy/TypeSupport.java	78.57% <0.00%> (+21.42%)	⬆️
... and 4 more

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[reta]

@TimvdLippe please let me know if I missed some places, I think we are good to go, thank you!

[TimvdLippe]

Awesome thank you!

[TWiStErRob]

Note: this was partially reverted in #2891 to supply Android compatibility.