[m-rev.] diff: add options for smart recompilation

[Simon Taylor]

Estimated hours taken: 0.2

compiler/options.m:
	Add options (--smart-recompilation, --verbose-recompilation,
	--warn-smart-recompilation) to control smart recompilation. These
	currently do nothing and are not documented, but
	it's convenient to have them accepted and ignored
	by the installed compiler.

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