Update PostprocessBundle.cmake to include /opt/homebrew/lib

[telephono]

Homebrew on macOS arm64 lives in /opt/homebrew per default. Add /opt/homebrew/lib to PostprocessBundle.cmake's extra_dirs. Without this, libsharpyuv.0.dylib cannot be found during bundeling resulting in the following error:

CMake Error at /Users/xxx/Sources/OpenXcom/cmake/modules/PostprocessBundle.cmake:44 (_message):
  otool -l failed: 1

  error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't
  open file: @rpath/libsharpyuv.0.dylib (No such file or directory)

Call Stack (most recent call first):
  /opt/homebrew/Cellar/cmake/3.27.4/share/cmake/Modules/BundleUtilities.cmake:458 (message)
  /opt/homebrew/Cellar/cmake/3.27.4/share/cmake/Modules/BundleUtilities.cmake:527 (get_item_rpaths)
  /opt/homebrew/Cellar/cmake/3.27.4/share/cmake/Modules/BundleUtilities.cmake:649 (set_bundle_key_values)
  /opt/homebrew/Cellar/cmake/3.27.4/share/cmake/Modules/BundleUtilities.cmake:933 (get_bundle_keys)
  /Users/xxx/Sources/OpenXcom/cmake/modules/PostprocessBundle.cmake:50 (fixup_bundle)


make[2]: *** [openxcom.app/Contents/MacOS/openxcom] Error 1
make[2]: *** Deleting file `openxcom.app/Contents/MacOS/openxcom'
make[1]: *** [src/CMakeFiles/openxcom.dir/all] Error 2
make: *** [all] Error 2

[telephono]

Sorry, didn't notice the change in line 50. I changed the file using GitHub's web editor...