net/spoofdpi: Update 0.10.11 → 0.10.12

Port changes:
 * Remove GO_TARGET output binary because program is renamed as spoofdpi now.
 * Add pkg-message to let users know there is a rc.d script for spoofdpi.

Changelog:
 * Renamed the name of binary to spoofdpi
https://github.com/xvzc/SpoofDPI/releases/tag/0.10.12

PR:	281088