Replace riscv64 vector GCC CI with clang toolchain. #8

Job	Run time
cmake-linux-aarch64	38m 17s
cmake-linux-aarch64	39m 6s
cmake-linux-local	23m 35s
cmake-linux-local	23m 35s
cmake-linux-armhf	29m 53s
cmake-linux-armhf	30m 15s
cmake-ios-x86_64	6m 16s
cmake-ios-x86_64	6m 16s
cmake-ios-arm64	8m 32s
cmake-ios-arm64	8m 32s
cmake-linux-riscv64	13m 41s
cmake-linux-riscv64	13m 41s
cmake-android (build-android-arm64.sh)	15m 17s
cmake-android (build-android-arm64.sh)	15m 17s
cmake-linux-riscv64-rvv	50m 39s
cmake-linux-riscv64-rvv	50m 39s
cmake-android (build-android-armv7.sh)	15m 17s
cmake-android (build-android-armv7.sh)	15m 17s
cmake-macos-arm64	27m 39s
cmake-macos-arm64	27m 39s
cmake-android (build-android-x86.sh)	18m 15s
cmake-android (build-android-x86.sh)	18m 15s
cmake-macos-x86_64	47m 50s
cmake-macos-x86_64	47m 50s
cmake-windows-arm64	27m 35s
cmake-windows-arm64	27m 35s
cmake-windows-x64	31m 33s
cmake-windows-x64	31m 33s
cmake-windows-x86	32m 57s
cmake-windows-x86	32m 57s
bazel-linux	17m 15s
bazel-linux	17m 15s
	13h 30m 13s

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