CMake 4.1 and earlier did not issue an error if an imported shared library target
was missing an IMPORTED_IMPLIB property and nothing used that imported
library. There was no code path checking for the CMP0111 NEW behavior. Since
b626843d71 (fileAPI: Output all INTERFACE and IMPORTED targets, 2025-09-13),
we now include all imported targets in the file API replies, and that does trigger
that check. We need to tolerate such imported targets to preserve backward
compatibility, and to avoid issuing errors for problems in targets likely to be
coming from outside the project and beyond the developer's control.
Fixes: #27496
Craig Scott
Taylor Sasser
Kyle Edwards