Avoid stdout buffer allocation

[jridgewell]

Your comment reminded me to fix this one, too.

[maysupan]

Thank!

[evanw]

One concern here is that something later on would save a copy of some subarray of this subarray, which could then get overwritten later. But I checked the decoding code and it appears to always make a copy, so this should be ok I think:

esbuild/lib/stdio_protocol.ts

Lines 316 to 322 in afa91d7

	read(): Uint8Array {
	let length = this.read32();
	let bytes = new Uint8Array(length);
	let ptr = this._read(bytes.length);
	bytes.set(this.buf.subarray(ptr, ptr + length));
	return bytes;
	}