Vulkan: Remove MoltenVK

Blender had some support for using MoltenVK. However there are some key
issues why MotlenVK cannot be used. Bugs have been reported up-stream.
As it doesn't work and holds back regular developments it will be removed
from the main branch.

Any efforts on making Vulkan run on Apple (including KosmicKrisp)
is considered a community effort and can be done in a development
branch.

Pull Request: https://projects.blender.org/blender/blender/pulls/144602

extern/vulkan_memory_allocator/CMakeLists.txt

@@ -10,12 +10,6 @@ set(INC_SYS
   ${VULKAN_INCLUDE_DIRS}
 )
 
-if(APPLE)
-  list(APPEND INC_SYS
-    ${MOLTENVK_INCLUDE_DIRS}
-  )
-endif()
-
 set(SRC
   vk_mem_alloc_impl.cc
 

extern/vulkan_memory_allocator/vk_mem_alloc_impl.cc

@@ -4,11 +4,7 @@
 
 #include <cstdio>
 
-#ifdef __APPLE__
-#  include <MoltenVK/vk_mvk_moltenvk.h>
-#else
-#  include <vulkan/vulkan.h>
-#endif
+#include <vulkan/vulkan.h>
 
 #define VMA_IMPLEMENTATION