Neuter our `PACKAGE_URL` in SNMP code builds, update release docs [#1… #271

Job	Run time
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, no)	5m 6s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-1.0)	5m 16s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-0.1)	5m 14s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, no)	5m 16s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-1.0)	5m 45s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-0.1)	5m 9s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, no)	7m 11s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-1.0)	5m 29s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-0.1)	5m 25s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, no)	5m 7s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-1.0)	5m 9s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-0.1)	5m 9s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, no)	5m 8s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-1.0)	5m 33s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-0.1)	5m 21s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, no)	5m 20s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-1.0)	5m 24s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-0.1)	5m 20s
Analyze (python, ubuntu-latest, PYTHON=python3, no, no)	2m 17s
	1h 39m 39s

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