rt_names: stop allocating 5k in rwdata

objsizes: don't show build machinery's object modules

scripts/objsizes

@@ -1,7 +1,8 @@
 #!/bin/sh
 
 printf "%9s %11s %9s %9s %s\n" "text+data" text+rodata rwdata bss filename
-find -name '*.o' | sed 's:^\./::' | xargs size | grep '^ *[0-9]' \
+find -name '*.o' | grep -v '^\./scripts/' | grep -vF built-in.o \
+| sed 's:^\./::' | xargs size | grep '^ *[0-9]' \
 | while read text data bss dec hex filename; do
     printf "%9d %11d %9d %9d %s\n" $((text+data)) $text $data $bss "$filename"
 done | sort -r