[BusyBox] improved format function for utility.c

[Manuel Novoa III]

Here is a replacement for the format function in utility.c.
On i386 with -Os -fomit-frame-pointer, I get the following sizes:

   text	   data	    bss	    dec	    hex	filename
    139	      0	     10	    149	     95	new without 0-val test
    151	      0	     10	    161	     a1	new with 0-val test
    268	     10	      0	    278	    116	original function

One minor (very unlikely bug) fixed... if val > LONG_MAX and hr == 1, the
original code would output a negative value due to the %ld format being used.

Manuel
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