Move messages.c to libbb. Make each string in messages.c be its own .o file.

This way, we can new get rid of all that tedious #define rubbish we used to
need to enable specific messages.  This way is enormously simpler, and as a
bonus also ends up saving us 96 bytes.
 -Erik

coreutils/chown.c

@@ -27,10 +27,6 @@
 #include <string.h>
 #include <unistd.h>
 #include "busybox.h"
-#define BB_DECLARE_EXTERN
-#define bb_need_too_few_args
-#include "messages.c"
-
 
 /* Don't use lchown for libc5 or glibc older then 2.1.x */
 #if (__GLIBC__ < 2) && (__GLIBC_MINOR__ < 1)