[PATCH] make sizes is a .PHONY; add make modsizes target

[Denis Vlasenko]

If file "sizes" exists, make sizes may fail:

# make sizes >sizes; head -10 sizes
make[1]: `sizes' is up to date.

Fixed:

# make sizes >sizes; head -10 sizes
nm --size-sort busybox_unstripped
00000001 t askpass_timeout
00000001 b base
00000001 b c.1
00000001 b com_fl
00000001 b completed.1
00000001 b del_fl
00000001 d delim
00000001 b do_continue
00000001 b erase_char

Patch also adds 'make modsizes':

# make modsizes
text+data text+rodata    rwdata       bss filename
        0           0         0         0 init/init_shared.o
        0           0         0         0 libbb/bb_common_bufsiz1.o
        0           0         0         0 libbb/bb_pwd.o
        0           0         0         0 libbb/llist.o
        0           0         0         0 libbb/messages.o
        0           0         0         0 libbb/opendir.o
        0           0         0         0 libbb/printf.o
        0           0         0         0 libbb/vdprintf.o
        0           0         0         0 libbb/vfork_daemon_rexec.o
        0           0         0         0 libbb/xfuncs.o
        0           0         0         0 libbb/xgetularg.o
        1           1         0         0 archival/libunarchive/header_skip.o
        3           3         0         0 coreutils/true.o
        4           0         4         0 libbb/default_error_retval.o
        6           6         0         0 coreutils/false.o
        7           7         0         0 libbb/perror_nomsg_and_die.o
        9           9         0         0 libbb/perror_nomsg.o
       10          10         0         0 libbb/mtab_file.o
       13          13         0         0 libbb/shell_file.o
       14          14         0         0 libbb/bb_dev_null.o
       14          14         0         0 libbb/motd_file.o
       14          14         0         0 libbb/unknown.o
...
    24470       23306      1164     13360 shell/msh.o
    26770       26766         4       904 miscutils/hdparm.o
    45844       45600       244      1856 shell/ash.o
    49597       49565        32     11388 util-linux/fdisk.o
    55434       55158       276      4468 scripts/config/zconf.tab.o
    64654       64654         0        12 applets/applets.o

Please apply
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vda                                    
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