build: consistent spacing between lists (cosmetics)

configure

@@ -1439,9 +1439,11 @@ AVDEVICE_COMPONENTS="
     indevs
     outdevs
 "
+
 AVFILTER_COMPONENTS="
     filters
 "
+
 AVFORMAT_COMPONENTS="
     demuxers
     muxers
@@ -1449,6 +1451,7 @@ AVFORMAT_COMPONENTS="
 "
 
 AVRESAMPLE_COMPONENTS=""
+
 AVUTIL_COMPONENTS=""
 
 COMPONENT_LIST="
@@ -1483,6 +1486,7 @@ EXAMPLE_LIST="
     transcode_aac_example
     transcoding_example
 "
+
 EXTERNAL_AUTODETECT_LIBRARY_LIST="
     alsa
     bzlib
@@ -1592,6 +1596,7 @@ EXTERNAL_LIBRARY_LIST="
     opengl
     videotoolbox
 "
+
 HWACCEL_AUTODETECT_LIBRARY_LIST="
     audiotoolbox
     crystalhd