This is in preparation for additional generated sources rules for Android
which will require ad hoc rules, so it is necessary to replace old ones
NOTE: pre-existing gen rules based on $(transform-generated-source) macro
are both obsolete and use of '%' pattern rule is incompatible with ad hoc
python commands for different targets
Changelog:
- remove util/u_format_srgb.c target
- replace obsolete indices/{u_indices,unfilled}_gen.c 'common' gen rules
with 'per target' gen rules using $(MESA_PYTHON3) as per meson gen rules
Fixes: 3471af9c6c ("gallium/aux: Add GPU tracepoint mechanism")
Acked-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7942>
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