Merge branch 'sp/maint-http-enable-gzip' into maint

"git fetch" over http advertised that it supports "deflate", which
is much less common, and did not advertise more common "gzip" on its
Accept-Encoding header.

* sp/maint-http-enable-gzip:
Enable info/refs gzip decompression in HTTP client

diff --cc remote-curl.c
Simple merge