350949d0d4
Now that `textproc/docbook-utils' port had been undeprecated, revert part of the previous commit that disabled manpage generation. While here, adjust LICENSE to match the SPDX-License-Identifier (GPL-2.0+) and garbage-collect dependencies for calibration tools which had not been maintained, did not work well, and thus were removed five years ago (upstream commit 5a1bf35e by Richard Hughes). Fixes: 093b402a7dba, e7431c909036