resolved lib issue on ios #40

Job	Run time
test-wasm	1m 27s
build-android (aarch64-linux-android, aarch64-linux-android21-clang, llvm-ar)	2m 43s
generate-bindings	2m 37s
build-android (armv7-linux-androideabi, armv7a-linux-androideabi21-clang, llvm-ar)	3m 3s
build-android (x86_64-linux-android, x86_64-linux-android21-clang, llvm-ar)	2m 49s
build-ios (x86_64-apple-ios)	4m 9s
test-rust	1m 21s
build-ios (aarch64-apple-ios)	3m 28s
	21m 37s

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