vulkan: Track dependencies of Python imports

The meson.build was unaware of transitive dependencies introduced by
Python imports.

Android still needs fixing. But I did not update the Android files lest
I break the build.

Ideally, we would fix this by using a Python runner that generates
a depfile, similar to how meson creates depfiles for C files by passing
flags -MD -MQ -MF to gcc. But this patch gets the job done, without
stalling on the ideal general solution, by manually tracking the Python
imports in new 'foo_depend_files' variables.

CC: mesa-stable@lists.freedesktop.org
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/1466>

src/vulkan/util/vk_dispatch_table_gen.py

@@ -33,6 +33,8 @@ import xml.etree.ElementTree as et
 from collections import OrderedDict, namedtuple
 from mako.template import Template
 
+# Mesa-local imports must be declared in meson variable
+# '{file_without_suffix}_depend_files'.
 from vk_extensions import *
 
 # We generate a static hash table for entry point lookup