Ninja Multi-Config: Restore TARGET_OBJECTS support in cross-configs
Since !6161 (merged) the TARGET_OBJECTS
genex, when referenced for linking, is now evaluated with
EvaluateForBuildsystem
enabled. This causes the object file paths to be
computed with a buildsystem-specific placeholder for the configuration.
This is normally fine because the placeholder will be evaluated by the
native buildsystem tool using the proper configuration. However, the
Ninja Multi-Config generator's ${CONFIGURATION}
placeholder may not
have the correct value for cross-config object files. Switch back to
using the per-config location of each object file for this generator.
Fixes: #22436 (closed)
Backport: release