const compress/zlib.zlibDeflate

2 uses

	compress/zlib (current package)
		reader.go#L37: 	zlibDeflate   = 8
		reader.go#L150: 	if (z.scratch[0]&0x0f != zlibDeflate) || (z.scratch[0]>>4 > zlibMaxWindow) || (h%31 != 0) {