CMake: Fix Compiling Shader Builder on macOS

Due to changes in the build environment shader_builder wasn't able to
compile on macOs. This patch reverts several recent changes to CMake files.

* dbb2844ed9
* 94817f64b9
* 1b6cd937ff

The idea is that in the near future shader_builder will run on the buildbot as
part of any regular build to ensure that changes to the CMake doesn't break
shader_builder and we only detect it after a few days.

Pull Request: https://projects.blender.org/blender/blender/pulls/115929

intern/utfconv/CMakeLists.txt

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 set(INC
-  PUBLIC .
+  .
 )
 
 set(INC_SYS
@@ -19,16 +19,14 @@ set(SRC
 set(LIB
 )
 
-# This library is currently windows only, for the other platforms an empty target is created this
-# way we don't have to clutter if(WIN32) ... endif() all over the place to use this library.
+# This is odd but leave it for now...
+# Why have win32 check here? - this is only used for windows.
+# ... because one day we might want to use it on other platforms.
 if(WIN32)
   list(APPEND SRC
     utf_winfunc.cc
     utf_winfunc.hh
   )
-  blender_add_lib(bf_intern_utfconv "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
-else()
-  add_library(bf_intern_utfconv INTERFACE)
 endif()
 
-add_library(bf::intern::utfconv ALIAS bf_intern_utfconv)
+blender_add_lib(bf_intern_utfconv "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")