scripts/tags.sh: Add support for rust source files

When executing the command `make cscope`, the `cscope.files` file
generated by it includes only filenames with the extensions *.h, *.c,
*.S and not includes filenames with *.rs extensions.

To fix this, modify the functions `find_arch_sources()`,
`find_arch_include_sources()`, `find_include_sources()`, and
`find_other_sources()` so that they can accept an unlimited number of
filename patterns as parameters for the search. Add the
`setup_name_pattern()` function to convert these filename pattern
parameters into a list of parameters that can be passed to the `find`
utility via the new `pattern` variable.

Signed-off-by: Sergei Litvin <litvindev@gmail.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Tested-by: Nicolas Schier <n.schier@fritz.com>
Reviewed-by: Nicolas Schier <n.schier@fritz.com>
Link: https://patch.msgid.link/20260714125259.78824-1-litvindev@gmail.com
[nsc: cleaned-up commit message line breaks and removed cc trailers]
Signed-off-by: Nicolas Schier <nsc@kernel.org>

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