patch.pre_args v patch.args for -p#

[Jeremy Lavergne]

We're inconsistent in how we handle the -p# flag for patch.

audio/id3lib/Portfile:patch.pre_args     -p1
comms/gnokii/Portfile:patch.args      -p1

Documentation says patch.pre_args: shall we go through and tweak these to reflect the desired behavior to better serve as examples to new maintainers?

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