*: Fix compile error under macos

[JaySon-Huang]

Fix the following errors:

• Fix the cmake error under macos in the previous code

  >  cmake -S . -B cmake-build
  -- The C compiler identification is AppleClang 15.0.0.15000100
  -- The CXX compiler identification is AppleClang 15.0.0.15000100
  -- Detecting C compiler ABI info
  -- Detecting C compiler ABI info - done
  -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
  -- Detecting C compile features
  -- Detecting C compile features - done
  -- Detecting CXX compiler ABI info
  -- Detecting CXX compiler ABI info - done
  -- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
  -- Detecting CXX compile features
  -- Detecting CXX compile features - done
  find package: SDL2 ...
  cmake find SDL2 failed! use pkg-config...
  pkg-config found OK
  pkg-config found SDL2
  SDL2 information:
      include dir: /opt/homebrew/include;/opt/homebrew/include/SDL2
      SDL libs: SDL2
  CMake Error at 3rdlibs/sdl2/CMakeLists.txt:34 (target_include_directories):
  target_include_directories called with invalid arguments

• std::filesystem::path does not have default hash operator to be the key of unordered_map. I've define a functor class for it

• Fix that Sampler::Wrapper::operator== compare float array in an incorrect way

[JaySon-Huang]

It can build successfully under my macbook now

>  cmake --build cmake-build
[  1%] Built target glad
[  4%] Built target imgui
[  7%] Built target ImGuizmo
[  7%] Built target stb_image
[  8%] Built target toml++
[ 13%] Built target mirrow
[ 14%] Built target miniaudio
[ 14%] Built target nanobench
[ 31%] Built target freetype
[ 43%] Built target lunasvg
[ 54%] Built target efsw
[ 64%] Built target efsw-static
[ 70%] Built target easy_profiler
[ 71%] Built target profiler_converter
[ 72%] Built target profiler_sample
[ 73%] Built target profiler_sample_disabled_profiler
[ 74%] Built target profiler_reader
[ 75%] Built target nickel_core
[ 87%] Built target nickel
[ 87%] Built target ImGuiPlugin
[ 94%] Built target editor
[ 94%] Built target gjk_bench
[ 95%] Built target geom
[ 96%] Built target cgmath
[ 97%] Built target tweeny
[ 97%] Built target csv_iterator
[ 98%] Built target gjk
[ 99%] Built target geom_testbed
[100%] Built target physics_testbed