Makefile.am, configure.ac, NEWS.adoc: implement `make install-as-root` [#1298] #2561

Job	Run time
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, no)	4m 28s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-1.0)	4m 40s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-0.1)	4m 56s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, no)	4m 51s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-1.0)	4m 46s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-0.1)	5m 5s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, no)	4m 47s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-1.0)	4m 53s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-0.1)	5m 13s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, no)	4m 49s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-1.0)	5m 11s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-0.1)	5m 9s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, no)	6m 21s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-1.0)	4m 57s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-0.1)	5m 11s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, no)	5m 12s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-1.0)	5m 4s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-0.1)	5m 14s
Analyze (python, ubuntu-latest, PYTHON=python3, no, no)	1m 12s
	1h 31m 59s

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