Setting the NO_* knobs in make.conf (or src.conf in FreeBSD 7+) just tells the build system to not build or install those bits. However, the build system does not delete items during normal operation.
However, you can use the delete-old and delete-old-libs targets to delete old binaries and libraries. I believe these will check the NO_* knobs and delete those items as well, but I have never tested that.
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