[PATCH] fdisk: Add support for GPT partition type codes

[Simon Rettberg]

Now that I needed to get the type codes of GPT partitions in a script I
decided to add this functionality to busybox fdisk, which had a big
FIXME in the code and just printed 0700 for every partition (and gave me
some headache before I realized this).
Since this adds a big lookup table I made this feature optional and off by
default.
With feature enabled:

function                                             old     new   delta
.rodata                                            82378   83602   +1224
static.list_table                                   1268    1381    +113
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 1337/0)           Total: 1337  
bytes
      text	   data	    bss	    dec	    hex	filename
    543392	   3899	   1920	 549211	  8615b	busybox_old
    544729	   3899	   1920	 550548	  86694	busybox_unstripped

This also changes the format-specifier from %04x to %04X since, as far as
I can tell, the output format is based on that of gdisk, which also uses
uppercase letters for the type code.

I have some doubt that printing 0700 if this feature is disabled is the
best choice, as this could mislead others as well. Maybe using FFFF
(=unknown GUID type code) or just printing '-' or '?' would make more
sense, but I didn't dare to change this for the sake of backwards
compatibility.

Lastly, I added the embarrassing one-liner I used for creating the lookup
table as a comment, to document where the values come from and make it
easier to update the list in the future. In case this breaks any style
guidelines it might be preferable to move this to some readme file or even
create a more readable external script that does all the magic.

- Simon
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