Change in flashrom[master]: libflashrom: remove flashrom_supported_programmers

[Nico Huber (Code Review)]

Attention is currently required from: Michał Żygowski, ?ukasz Dmitrowski, David Hendricks, Thomas Heijligen, Angel Pons, Piotr Król.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/55350 )

Change subject: libflashrom: remove flashrom_supported_programmers
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Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/flashrom/+/55350/comment/4e369ad7_8d18041e 
PS1, Line 9: const char **flashrom_supported_programmers(void) returns an array of
           : strings without returning the array size or making a NULL
           : termination.
> CB:55269 happens to NULL-terminate the returned array.

It does, but I would still like to get rid of this API. There are other
issues, e.g. the complementary flashrom_data_free() is designed such
that only a single implementation is possible. Beside making future
changes harder, it indirectly leaks information about libflashrom
internals.

Given that it was broken all the time, I assume nobody is using it,
so I guess it would be best to drop it before anybody does.