Fix appveyor CI custom prereq build debug #2603

Job	Run time
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, no)	4m 14s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-1.0)	4m 52s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, no, libusb-0.1)	5m 3s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, nss, no)	4m 56s
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)	4m 59s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, no)	5m 0s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-1.0)	5m 1s
Analyze (cpp, ubuntu-latest, CC=gcc CXX=g++, openssl, libusb-0.1)	5m 3s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, no)	4m 42s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-1.0)	4m 53s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, no, libusb-0.1)	5m 17s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, no)	5m 38s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-1.0)	5m 10s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, nss, libusb-0.1)	6m 16s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, no)	4m 45s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-1.0)	5m 2s
Analyze (cpp, ubuntu-latest, CC=clang CXX=clang++, openssl, libusb-0.1)	4m 57s
Analyze (python, ubuntu-latest, PYTHON=python3, no, no)	1m 14s
	1h 31m 48s

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