configure: When disabling a library disable all the related components

This way is sufficient to use the component specific configure variable
and not guard against the global library configure variable in code
that is outside it (e.g. checkasm).

configure

@@ -1129,20 +1129,39 @@ cp_if_changed(){
 # CONFIG_LIST contains configurable options, while HAVE_LIST is for
 # system-dependent things.
 
-COMPONENT_LIST="
+AVCODEC_COMPONENTS="
     bsfs
     decoders
-    demuxers
     encoders
-    filters
     hwaccels
-    indevs
-    muxers
-    outdevs
     parsers
+"
+
+AVDEVICE_COMPONENTS="
+    indevs
+    outdevs
+"
+AVFILTER_COMPONENTS="
+    filters
+"
+AVFORMAT_COMPONENTS="
+    demuxers
+    muxers
     protocols
 "
 
+AVRESAMPLE_COMPONENTS=""
+AVUTIL_COMPONENTS=""
+
+COMPONENT_LIST="
+    $AVCODEC_COMPONENTS
+    $AVDEVICE_COMPONENTS
+    $AVFILTER_COMPONENTS
+    $AVFORMAT_COMPONENTS
+    $AVRESAMPLE_COMPONENTS
+    $AVUTIL_COMPONENTS
+"
+
 EXAMPLE_LIST="
     avcodec_example
     filter_audio_example
@@ -2600,6 +2619,18 @@ done
 
 disabled logging && logfile=/dev/null
 
+# Disable all the library-specific components if the library itself
+# is disabled, see AVCODEC_LIST and following _LIST variables.
+
+disable_components(){
+    disabled ${1} && disable $(
+        eval components="\$$(toupper ${1})_COMPONENTS"
+        map 'eval echo \${$(toupper ${v%s})_LIST}' $components
+    )
+}
+
+map 'disable_components $v' $LIBRARY_LIST
+
 echo "# $0 $LIBAV_CONFIGURATION" > $logfile
 set >> $logfile