CMake: resolve issue building without sorted libs

Linking empty libs gave an error.

build_files/cmake/macros.cmake

@@ -236,7 +236,9 @@ function(blender_add_lib__impl
 
 	# Use for testing 'BLENDER_SORTED_LIBS' removal.
 	if(DEFINED WITHOUT_SORTED_LIBS AND WITHOUT_SORTED_LIBS)
-		target_link_libraries(${name} "${libraries}")
+		if (NOT "${libraries}" STREQUAL "")
+			target_link_libraries(${name} "${libraries}")
+		endif()
 	endif()
 
 	# works fine without having the includes

source/creator/CMakeLists.txt

@@ -37,6 +37,9 @@ blender_include_dirs(
 	../blender/windowmanager
 )
 
+set(LIB
+)
+
 add_definitions(${GL_DEFINITIONS})
 blender_include_dirs("${GLEW_INCLUDE_PATH}")
 
@@ -1025,12 +1028,16 @@ add_dependencies(blender makesdna)
 # Use for testing 'BLENDER_SORTED_LIBS' removal.
 if(NOT (DEFINED WITHOUT_SORTED_LIBS AND WITHOUT_SORTED_LIBS))
 	setup_blender_sorted_libs()
+	target_link_libraries(blender ${BLENDER_SORTED_LIBS})
+else()
+	target_link_libraries(blender ${LIB})
 endif()
 
-target_link_libraries(blender ${BLENDER_SORTED_LIBS})
 
 setup_liblinks(blender)
 
+unset(LIB)
+
 # -----------------------------------------------------------------------------
 # Setup launcher