Cleanup: CMake: Modernize bf_blenlib dependencies

Pretty straightforward

- Remove any blenlib paths from INC
- Add a dependency though LIB

Pull Request: https://projects.blender.org/blender/blender/pulls/109934

source/blender/python/mathutils/CMakeLists.txt

@@ -5,7 +5,6 @@
 set(INC
   .
   ../../blenkernel
-  ../../blenlib
   ../../bmesh
   ../../depsgraph
   ../../imbuf
@@ -42,7 +41,7 @@ set(SRC
 )
 
 set(LIB
-  bf_blenlib
+  PRIVATE bf::blenlib
   PRIVATE bf::dna
   bf_imbuf
   PRIVATE bf::intern::guardedalloc