better way to handle required rebuild on library bump

[Doug Barton]

With due respect to the creativity of the OP, the whole conversation is 
basically moot since in almost all cases a library major version change 
requires a change to the LIB_DEPENDS line in the port anyway, so a 
PORTREVISION bump is a very tiny bit of additional work.

And I agree with b.f., without actual code to review it's hard to have 
an intelligent conversation about this.


Doug

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