CMake: prepare for BLENDER_SORTED_LIBS removal

No functional change, this adds LIB definition and args to cmake files.
Without this it's difficult to migrate away from 'BLENDER_SORTED_LIBS'
since there are many platforms/configurations that could break when
changing linking order.

Manually add and enable WITHOUT_SORTED_LIBS to try building
without sorted libs (currently fails since all variables are empty).
This check will eventually be removed.

See T46725.

intern/audaspace/CMakeLists.txt

@@ -38,6 +38,9 @@ endif()
 		intern/AUD_Set.h
 	)
 
+set(LIB
+)
+
 if(WITH_PYTHON)
 	list(APPEND INC_SYS
 		${PYTHON_INCLUDE_DIRS}
@@ -49,4 +52,4 @@ if(WITH_PYTHON)
 	add_definitions(-DWITH_PYTHON)
 endif()
 
-blender_add_lib(bf_intern_audaspace "${SRC}" "${INC}" "${INC_SYS}")
+blender_add_lib(bf_intern_audaspace "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")