macOS/bpy: add support for OpenMP

Changes made:
* Add OpenMP linker flags.
* Copy the libomp.dylib to `2.93/lib/libomp.dylib`.
* Change the `LC_LOAD_DYLIB` item such that
  the lib is found at `bpy.so/../../Resources/2.93/lib/libomp.dylib`.
Installation is done by D10664.

Reviewed By: #platform_macos, brecht
Maniphest Tasks: T86579
Differential Revision: https://developer.blender.org/D10657

CMakeLists.txt

@@ -1235,6 +1235,7 @@ if(WITH_OPENMP)
       string(APPEND CMAKE_C_FLAGS " ${OpenMP_C_FLAGS}")
       string(APPEND CMAKE_CXX_FLAGS " ${OpenMP_CXX_FLAGS}")
       string(APPEND CMAKE_EXE_LINKER_FLAGS " ${OpenMP_LINKER_FLAGS}")
+      string(APPEND CMAKE_MODULE_LINKER_FLAGS " ${OpenMP_LINKER_FLAGS}")
     else()
       # Typically avoid adding flags as defines but we can't
       # pass OpenMP flags to the linker for static builds, meaning