libc: Add test cases for N2680.

This adds test cases for %wN and %wfN to the printf(3) and scanf(3) tests.

While here, fix a few nits in the N2630 test cases.

Reviewed by: imp
Differential Revisio

libc: Add test cases for N2680.

This adds test cases for %wN and %wfN to the printf(3) and scanf(3) tests.

While here, fix a few nits in the N2630 test cases.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D41743

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libc: Fix fixed-width case in the new integer parser.

Fixes: d9dc1603d6e4
Differential Revision: https://reviews.freebsd.org/D41622

libc: Add unit tests for N2630 and possible collateral damage.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41512