Don't add avif_obj's object files to avif_apps_obj

Do not add the object files in the avif_obj library to the avif_apps_obj
library. avif_apps_obj should contain only the object files compiled
from source files in the apps/shared/ and from
third_party/iccjpeg/iccjpeg.c.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 21aee88..55b7bd2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -684,8 +684,8 @@
     endif()
 
     add_library(
-        avif_apps_obj OBJECT $<TARGET_OBJECTS:avif_obj> apps/shared/avifexif.c apps/shared/avifjpeg.c apps/shared/avifpng.c
-                             apps/shared/avifutil.c apps/shared/iccmaker.c apps/shared/y4m.c third_party/iccjpeg/iccjpeg.c
+        avif_apps_obj OBJECT apps/shared/avifexif.c apps/shared/avifjpeg.c apps/shared/avifpng.c apps/shared/avifutil.c
+                             apps/shared/iccmaker.c apps/shared/y4m.c third_party/iccjpeg/iccjpeg.c
     )
     # Instead of building avif_apps/avif_apps_internal and linking to avif/avif_internal, avif_apps_obj only does one compilation.
     # Still, the compile definitions needs to be passed from avif to avif_apps. The following also passes them to avif_apps_internal but AVIF_DLL does not impact avif_apps_internal.