Fix: build target wasm32-unknown-emscripten #1374

Job	Run time
linux_native_builds (x86_64-unknown-linux-gnu)	4m 32s
minver	18s
macos-aarch64	3m 32s
macos	6m 11s
linux_native_builds (x86_64-unknown-linux-musl)	3m 54s
rust_stable	1m 25s
tier3 (x86_64-unknown-dragonfly)	1m 1s
rustfmt	4s
tier3 (x86_64-unknown-openbsd)	58s
tier3 (x86_64-unknown-haiku)	1m 0s
redox	43s
cross (arm-unknown-linux-gnueabi)	1m 44s
cross_compiling (aarch64-linux-android)	38s
cross (armv7-unknown-linux-gnueabihf)	1m 49s
cross_compiling (arm-linux-androideabi)	37s
cross (i686-unknown-linux-gnu)	1m 46s
cross_compiling (armv7-linux-androideabi)	39s
cross (i686-unknown-linux-musl)	1m 53s
cross_compiling (i686-linux-android)	36s
cross (mips-unknown-linux-gnu)	1m 47s
cross_compiling (x86_64-linux-android)	36s
cross (mips64-unknown-linux-gnuabi64)	2m 0s
cross_compiling (arm-unknown-linux-musleabi)	40s
cross (mips64el-unknown-linux-gnuabi64)	1m 49s
cross_compiling (x86_64-unknown-fuchsia)	30s
cross (mipsel-unknown-linux-gnu)	1m 53s
cross_compiling (x86_64-unknown-illumos)	34s
cross (powerpc64le-unknown-linux-gnu)	1m 47s
cross_compiling (aarch64-apple-ios, true)	32s
cross_compiling (powerpc64-unknown-linux-gnu)	38s
cross_compiling (s390x-unknown-linux-gnu)	41s
cross_compiling (x86_64-unknown-linux-gnux32)	41s
cross_compiling (x86_64-unknown-netbsd)	39s
	48m 7s

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