Some unit test failures on Apple M2 Silicon

[louis-langholtz]

Expected/Desired Behavior or Experience:

Unit tests all pass on Apple Silicon on master branch.

Actual Behavior:

The following unit test failures are seen on Apple M2 Silicon from the master branch:

PlayRho/UnitTests/World.cpp:2798: Failure
Expected: (world->GetContactRange()) <= (1450u), actual: 1451 vs 1450
PlayRho/UnitTests/World.cpp:2800: Failure
Expected: (totalBodiesSlept) <= (668u), actual: 670 vs 668
PlayRho/UnitTests/World.cpp:2957: Failure
Expected equality of these values:
  numSteps
    Which is: 1799
  1814ul
    Which is: 1814
PlayRho/UnitTests/World.cpp:2958: Failure
Expected equality of these values:
  sumRegPosIters
    Which is: 36512
  36600ul
    Which is: 36600
PlayRho/UnitTests/World.cpp:2959: Failure
Expected equality of these values:
  sumRegVelIters
    Which is: 46940
  264096ul
    Which is: 264096
PlayRho/UnitTests/World.cpp:2960: Failure
Expected equality of these values:
  sumToiPosIters
    Which is: 44021
  45022ul
    Which is: 45022
PlayRho/UnitTests/World.cpp:2961: Failure
Expected equality of these values:
  sumToiVelIters
    Which is: 113137
  148560ul
    Which is: 148560
[  FAILED  ] World_Longer.TilesComesToRest (2118 ms)
PlayRho/UnitTests/functional.cpp:27: Failure
Expected equality of these values:
  sizeof(std::function<int()>)
    Which is: 32
  std::size_t(48)
    Which is: 48
PlayRho/UnitTests/functional.cpp:28: Failure
Expected equality of these values:
  sizeof(std::function<void(int)>)
    Which is: 32
  std::size_t(48)
    Which is: 48
PlayRho/UnitTests/functional.cpp:29: Failure
Expected equality of these values:
  sizeof(std::function<float(int)>)
    Which is: 32
  std::size_t(48)
    Which is: 48
PlayRho/UnitTests/functional.cpp:30: Failure
Expected equality of these values:
  sizeof(std::function<int(float)>)
    Which is: 32
  std::size_t(48)
    Which is: 48
PlayRho/UnitTests/functional.cpp:31: Failure
Expected equality of these values:
  sizeof(std::function<int(double)>)
    Which is: 32
  std::size_t(48)
    Which is: 48
PlayRho/UnitTests/functional.cpp:32: Failure
Expected equality of these values:
  sizeof(std::function<int(double, long, void*)>)
    Which is: 32
  std::size_t(48)
    Which is: 48
[  FAILED  ] functional.FunctionSize (0 ms)
[==========] 1158 tests from 113 test suites ran. (3020 ms total)
[  PASSED  ] 1156 tests.

Steps to Reproduce the Actual Behavior:

cd Playrho
mkdir ../Playrho-build
cd ../Playrho-build
cmake -DPLAYRHO_BUILD_UNIT_TESTS=ON ../PlayRho
make
cd UnitTests
./UnitTests --gtest_brief=1