Fix errors in Github CI. #455

Job	Run time
linux_opts (gcc, no_fp)	41s
linux_opts (gcc, no_reader)	23s
linux_opts (gcc, no_writer)	35s
linux_clang_latest	2m 39s
linux_checks (Debug, Default, Valgrind)	4m 13s
linux_opts (gcc, no_utf8)	49s
linux_archs (i386)	1m 24s
linux_checks (Debug, Default, Sanitizer)	1m 14s
linux_opts (clang, no_fp)	43s
linux_archs (arm32v7)	5m 8s
linux_checks (Debug, ReduceBinary, Valgrind)	4m 8s
linux_gcc_latest	2m 54s
linux_opts (clang, no_reader)	46s
linux_archs (arm64v8)	5m 7s
linux_checks (Debug, ReduceBinary, Sanitizer)	1m 3s
linux_archs (ppc64le)	5m 5s
linux_opts (clang, no_writer)	32s
linux_checks (Release, Default, Valgrind)	2m 43s
linux_archs (s390x)	5m 6s
linux_opts (clang, no_utf8)	47s
linux_gcc4	48s
linux_checks (Release, Default, Sanitizer)	1m 31s
linux_archs (riscv64)	5m 5s
linux_checks (Release, ReduceBinary, Valgrind)	3m 27s
linux_checks (Release, ReduceBinary, Sanitizer)	1m 14s
linux_gcc5_i386	1m 10s
linux_tinycc	33s
linux_checks (MinSizeRel, Default, Valgrind)	2m 54s
macos_clang	29s
linux_checks (MinSizeRel, Default, Sanitizer)	1m 26s
windows_msvc	1m 19s
linux_checks (MinSizeRel, ReduceBinary, Valgrind)	3m 44s
codecov	50s
linux_checks (MinSizeRel, ReduceBinary, Sanitizer)	1m 11s
fuzzing	4m 24s
	1h 16m 5s

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