Remove unnecessary write_delete_marker_file #7653
Merged
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InstallRequirement only checks for a delete marker file in source_dir.
Since the result of ensure_build_location is set to source_dir (in
ensure_has_source_dir), and ensure_build_location returns a subdirectory
of the build_directory to which we write the delete marker file, then
this delete marker file is never used.
Progresses #7571.