Fix FastPFor build.

fastpfor/Makefile

@@ -1,14 +1,15 @@
 SHELL:=/bin/bash
 
 ubuntu1804:
-	git clone https://github.com/lemire/FastPFor
-	pushd FastPFor && git checkout 8030e3808f857cc12d1d09e264f1ad2a05b1964a # master at the time of writing
+	#git clone https://github.com/lemire/FastPFor
+	git clone https://github.com/rayburgemeestre/FastPFor
+	pushd FastPFor && git checkout change-google-test-branch
 	bash ../ubuntu1804.sh make impl
 	make package-ubuntu1804
 
 ubuntu2004:
-	git clone https://github.com/lemire/FastPFor
-	pushd FastPFor && git checkout 8030e3808f857cc12d1d09e264f1ad2a05b1964a # master at the time of writing
+	git clone https://github.com/rayburgemeestre/FastPFor
+	pushd FastPFor && git checkout change-google-test-branch # master at the time of writing
 	bash ../ubuntu2004.sh make impl
 	make package-ubuntu2004
 	bash ../ubuntu2004.sh chown $$(id -u):$$(id -g) . -R  # fix permissions