Buidler / Use native solc compiler, instead of default solcjs

buidler.config.ts

const { TASK_COMPILE_RUN_COMPILER } = require('@nomiclabs/buidler/builtin-tasks/task-names')

internalTask(TASK_COMPILE_RUN_COMPILER)
    .setAction(async (taskArgs, bre, runSuper) => {
        const { input } = taskArgs
        const { execSync } = require('child_process')
        const fetch = require('node-fetch')
        const version = config.solc && config.solc.version || '0.5.16'
        const solcPath = `cache/compilers/solc-v${version}`
        if (!fs.existsSync(solcPath)) {
            console.log(`Downloading native solidity compiler version ${version}`)
            const url = `https://github.com/ethereum/solidity/releases/download/v${version}/solc-static-linux`
            try {
                const resp = await fetch(url)
                if (!resp.ok || resp.status !== 200) {
                    throw new Error(`Download failed: ${resp.status} ${resp.statusText}: ${url}`)
                }
                const data = await resp.buffer()
                fs.mkdirSync(`cache`)
                fs.mkdirSync(`cache/compilers`)
                fs.writeFileSync(solcPath, data, { mode: 0o755 })
            } catch (err) {
                console.log(`Unable to install native solidity compiler version ${version}:`, err.message)
            }
        }
        if (fs.existsSync(solcPath)) {
            console.log(`Using native solidity compiler, version ${version}`)
            const output = execSync(`${solcPath} --standard-json`, {
                input: JSON.stringify(input, undefined, 2),
            })
            return JSON.parse(output.toString('utf8'))
        } else {
            return runSuper()
        }
    })