Dynamically generate format lookup table from drm_fourcc header

[soreau]

This eliminates the need to maintain a list of formats used for converting from fourcc codes to the prettier version by parsing drm_fourcc.h directly and building a header for use in pretty.c

[emersion]

If we auto-generate code for formats, we should probably do the same for modifiers too.

[emersion]

For reference, here's a similar Python script that generates Go: https://git.sr.ht/~emersion/go-drm/tree/master/fourcc.py

Here we don't need the #define values so it's not necessary to go as far as compiling and running a C executable to get them. Also the pkg-config stuff can be taken from Meson (as you do currently).

[soreau]

For reference, here's a similar Python script that generates Go: https://git.sr.ht/~emersion/go-drm/tree/master/fourcc.py

This was a huge help, thanks.

If we auto-generate code for formats, we should probably do the same for modifiers too.

Done.

I'd accept something which is written in Python 3

Done.

[soreau]

@ascent12 I think I've addressed all your concerns, let me know if there's anything else.

The build bot doesn't seem to be able to import python module but it builds fine here.

[soreau]

@emersion Thanks for the review.

I found that '^#define (DRM_FORMAT_MOD_BROADCOM\w+(?=\s))' is more correct and doesn't require stripping the result.

[ascent12]

Thanks