refactor: install clang tools on demand #588

Job	Run time
Build FreeBSD	4m 0s
Build i686-pc-windows-msvc	3m 56s
Build aarch64-apple-darwin	2m 52s
Build armv7-unknown-linux-gnueabihf	3m 45s
Build aarch64-unknown-linux-gnu	3m 41s
Build x86_64-pc-windows-msvc	4m 14s
Build x86_64-unknown-linux-gnu	3m 33s
Build x86_64-apple-darwin	2m 53s
Build x86_64-unknown-linux-musl	3m 46s
Build aarch64-pc-windows-msvc	2m 1s
Build aarch64-unknown-linux-musl	3m 39s
Test ${{ matrix.settings.target }} - node@${{ matrix.node }}	0s
Publish	0s
Test ${{ matrix.target }} - node@${{ matrix.node }}	0s
	38m 20s

Provide feedback