docs/asciidoc.conf: support anchors in PDF #296

Job	Run time
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, no)	6m 28s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-1.0)	4m 22s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-0.1)	4m 28s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, no)	4m 28s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-1.0)	4m 41s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, libusb-0.1)	4m 22s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, no)	4m 14s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-1.0)	4m 28s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-0.1)	4m 24s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, no)	4m 38s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-1.0)	4m 27s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-0.1)	4m 20s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, no)	4m 28s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-1.0)	4m 43s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-0.1)	4m 43s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, no)	4m 35s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-1.0)	4m 26s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-0.1)	4m 27s
Analyze (python, ubuntu-latest, PYTHON=python3, no, no)	1m 31s
	1h 24m 13s

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