find_package: Restore longer message when config files were considered
Since !851 (merged) we print only the one line
- Could NOT find Foo (missing: Foo_DIR)
when package Foo cannot be found in CONFIG mode and it is not REQUIRED.
However, in the case that package configuration files were found but not
used, this one line message leaves out important information. This can
happen when a package configuration file sets Foo_FOUND
to FALSE
or
when its package version file does not match the requested version.
Restore the longer message in these cases. Otherwise a seemingly valid
explicit Foo_DIR
setting appears to be silently ignored even if it was
considered.
Fixes: #17029 (closed)