before this change, the header files generated with `idl-compiler.py`
are not regenerated if `idl-compiler.py` is updated. but they should,
as the change to the script could in turn change the generated header
files. because we have a typo in the `DEPENDS` argument,
`${idle_compiler}` is expanded to an empty string.
in this change, the typo is corrected, and the dependency from the
generated headers to the script is correctly reflected in the building
rules.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closesscylladb/scylladb#21475
1f940d56b2