gitweb: Don't use Content-Encoding: header in git_snapshot
gitweb: Don't use Content-Encoding: header in git_snapshot

Do not use Content-Encoding: HTTP header in git_snapshot, using
instead type according to the snapshot type (compression type).
Some of web browser take Content-Encoding: to be _transparent_
also for downloading, and store decompressed file (with incorrect
compression suffix) on download.

Signed-off-by: Jakub Narebski <a6a1517a087f9f64a72f41a0de57ff01fbb0e412@gmail.com>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git