build: simplify weak-enabling of autodetected libraries

configure

@@ -3593,21 +3593,9 @@ done
 for lib in $AUTODETECT_LIBS; do
     enabled $lib && request $lib
 done
-
-# Enable platform codecs by default.
-enable_weak audiotoolbox
-
-# Enable hwaccels by default.
-enable_weak crystalhd d3d11va dxva2 vaapi vda vdpau videotoolbox_hwaccel xvmc
-enable_weak xlib libxcb libxcb_shm libxcb_shape libxcb_xfixes
-
-enable_weak cuda cuvid nvenc videotoolbox videotoolbox_encoder
-
-# Enable compression/decompression libraries by default
-enable_weak zlib bzlib lzma
-
-enable_weak iconv
-enable_weak securetransport schannel
+#TODO: switch to $AUTODETECT_LIBS when $THREADS_LIST is supported the same way
+enable_weak $EXTERNAL_AUTODETECT_LIBRARY_LIST
+enable_weak $HWACCEL_AUTODETECT_LIBRARY_LIST
 
 disabled logging && logfile=/dev/null