fix regression that broke type checking of CustomTarget outputs

We validate a few things here, such as the non-presence of '@INPUT' in
an output name. These got moved out of the CustomTarget constructor in
commit 11f96380351a88059ec55f1070fdebc1b1033117 and into KwargInfo, but
only for kwargs that took multiple values. This caused configure_file()
and unstable_rust.bindgen() to stop checking for this.

Add a shared single-output KW and use it in both places. This now
dispatches to _output_validator.

configure_file now validates subdirectories in output names the same way
we do elsewhere, directly in the typed_kwargs and by specifying the
erroring kwarg.

0 files changed, 0 insertions, 0 deletions