CMake: revert last weeks modernizations

The cleanup of blenkernel last weeks , caused the house of cards to
collapse on  top of bf_gpu's shader_builder, which is off by default
but used on a daily basis by the rendering team.

Given the fixes forward in #110394 ran into a ODR violation in OSL that
was hiding there for years, I don't see another way forward without
impeding the rendering teams productivity for "quite a while" as there
is no guarantee the OSL issue would be the end of it.

the only way forward appears to be back.

this reverts :

19422044ed
a670b53abe
0f541db97c
be516e8c81
3e88a2f44c
4e64b772f5
9547e7a317
07fe6c5a57

The problematic commit was 07fe6c5a57
as blenkernel links most of blender, it's a bit of a link order issue
magnet. Given all these commits stack, it's near impossible to revert
just that one without spending a significant amount of time resolving
merge conflicts. 99% of that work was automated, so easier to just
revert all of them, and re-do the work, than it is to deal with the
merge conflicts.

Pull Request: https://projects.blender.org/blender/blender/pulls/110438

source/blender/python/gpu/CMakeLists.txt

@@ -4,6 +4,7 @@
 
 set(INC
   .
+  ../../blenkernel
   ../../editors/include
   ../../gpu
   ../../imbuf
@@ -59,7 +60,6 @@ set(LIB
   ${Epoxy_LIBRARIES}
   ${PYTHON_LINKFLAGS}
   ${PYTHON_LIBRARIES}
-  PRIVATE bf::blenkernel
   PRIVATE bf::blenlib
   PRIVATE bf::dna
   PRIVATE bf::intern::guardedalloc