xbps-install doesn't follow 308 Permanent Redirects

[PhotonQuantum]

Problem

~> sudo xbps-install -Sv                                                                                                                                                1 12/23/23 21:42:57 PM
[*] Updating repository `https://mirror.sjtu.edu.cn/voidlinux/current/x86_64-repodata' ...
ERROR: [reposync] failed to fetch file `https://mirror.sjtu.edu.cn/voidlinux/current/x86_64-repodata': Permanent Redirect
[*] Updating repository `https://mirror.sjtu.edu.cn/voidlinux/current/multilib/nonfree/x86_64-repodata' ...
ERROR: [reposync] failed to fetch file `https://mirror.sjtu.edu.cn/voidlinux/current/multilib/nonfree/x86_64-repodata': Permanent Redirect
[*] Updating repository `https://mirror.sjtu.edu.cn/voidlinux/current/multilib/x86_64-repodata' ...
ERROR: [reposync] failed to fetch file `https://mirror.sjtu.edu.cn/voidlinux/current/multilib/x86_64-repodata': Permanent Redirect
[*] Updating repository `https://mirror.sjtu.edu.cn/voidlinux/current/nonfree/x86_64-repodata' ...
ERROR: [reposync] failed to fetch file `https://mirror.sjtu.edu.cn/voidlinux/current/nonfree/x86_64-repodata': Permanent Redirect
~>

(mirror.sjtu.edu.cn is now using HTTP 302 to work around this issue)

Expected behavior

xbps should follow HTTP 308 redirects.

Suspected cause

xbps/lib/fetch/http.c

Lines 111 to 115 in b75e151

	#define HTTP_REDIRECT(xyz) ((xyz) == HTTP_MOVED_PERM \
	|| (xyz) == HTTP_MOVED_TEMP \
	|| (xyz) == HTTP_TEMP_REDIRECT \
	|| (xyz) == HTTP_USE_PROXY \
	|| (xyz) == HTTP_SEE_OTHER)

I believe we can solve this issue by adding HTTP_PERM_REDIRECT to HTTP_REDIRECT.

Possible PR to blame: 90eb1d9