libtool: Clean mode

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1 4.7 Clean mode
1 ==============
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1 "Clean" mode deletes uninstalled libraries, executables, objects and
1 libtool's temporary files associated with them.
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1    The first MODE-ARG is the name of the program to use to delete files
1 (typically '/bin/rm').
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1    The remaining MODE-ARGS are either flags for the deletion program
1 (beginning with a '-'), or the names of files to delete.
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