Apache prefers to brotli over gzip when possible (#6822)
Brotli is a better (than gzip) compression algorithm derived by Google.
It's available in Apache 2.4.26 and later.
https://en.wikipedia.org/wiki/Brotli
https://httpd.apache.org/docs/2.4/mod/mod_brotli.html
Signed-off-by: Jack Cherng <jfcherng@gmail.com>