CMake: Fix building with WITH_VULKAN_BACKEND

Ghost uses vulkan in its public headers but none of the projects that
depend on ghost had the vulkan headers in its includes nor did
bf_intern_ghost expose this vulkan dependency itself publicly yet.

bf_windowmanager also did not express its dependency on
bf_intern_ghost yet used its headers.

this change fixes both issues.

Pull Request: https://projects.blender.org/blender/blender/pulls/112259

intern/ghost/CMakeLists.txt

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 set(INC
-  .
+  PUBLIC .
   ../clog
   ../../source/blender/imbuf
 )
@@ -89,8 +89,8 @@ if(WITH_VULKAN_BACKEND)
   )
 
   list(APPEND INC_SYS
-    ${VULKAN_INCLUDE_DIRS}
-    ${MOLTENVK_INCLUDE_DIRS}
+    PUBLIC ${VULKAN_INCLUDE_DIRS}
+    PUBLIC ${MOLTENVK_INCLUDE_DIRS}
   )
 
   list(APPEND LIB

source/blender/windowmanager/CMakeLists.txt

@@ -22,7 +22,6 @@ set(INC
   ../render
   ../sequencer
   ../../../intern/clog
-  ../../../intern/ghost
   ../../../intern/memutil
   ../../../extern/fmtlib/include
   ../bmesh
@@ -105,6 +104,7 @@ set(LIB
   bf_editor_screen
   PRIVATE bf::intern::guardedalloc
   bf_sequencer
+  bf_intern_ghost
 )
 
 if(WIN32)