Merge remote-tracking branch 'upstream/v1.x' into v1.x #55

Job	Run time
build-linux	1m 32s
build-android	7m 18s
build-macos	2m 51s
build-ios	1m 19s
build-cross-qemu-arm	2m 9s
build-cross-qemu-armhf	1m 34s
build-cross-qemu-aarch64	1m 57s
build-cross-qemu-riscv64	1m 40s
build-cross-qemu-ppc	1m 37s
build-cross-qemu-ppc64	1m 53s
build-cross-qemu-ppc64le	1m 44s
build-cross-qemu-s390x	1m 42s
build-cross-qemu-mips	1m 38s
build-cross-qemu-mips64	1m 40s
build-cross-qemu-mipsel	1m 44s
build-cross-qemu-mips64el	2m 15s
build-cross-qemu-arm (u64 slots)	2m 12s
build-cross-qemu-aarch64 (u64 slots)	1m 49s
build-cross-qemu-ppc (u64 slots)	1m 35s
build-cross-qemu-ppc64 (u64 slots)	1m 47s
	41m 56s

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