make: Canceling Rules

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1 10.5.6 Canceling Implicit Rules
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1 You can override a built-in implicit rule (or one you have defined
1 yourself) by defining a new pattern rule with the same target and
1 prerequisites, but a different recipe.  When the new rule is defined,
1 the built-in one is replaced.  The new rule's position in the sequence
1 of implicit rules is determined by where you write the new rule.
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1    You can cancel a built-in implicit rule by defining a pattern rule
1 with the same target and prerequisites, but no recipe.  For example, the
1 following would cancel the rule that runs the assembler:
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1      %.o : %.s
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