FindBISON: Fix CMP0088 NEW behavior for non-absolute input paths
Now that the working directory is in the build tree, relative input paths must be converted to an absolute path to remain relative to the source directory.
Fixes: #19472 (closed)
Now that the working directory is in the build tree, relative input paths must be converted to an absolute path to remain relative to the source directory.
Fixes: #19472 (closed)