The "fix fetching of https URLs with http proxy" commit
broke the usual http-to-https redirect:
$ wget http://busybox.net/downloads/busybox-1.29.0.tar.bz2
Connecting to busybox.net (140.211.167.122:80)
Connecting to busybox.net (140.211.167.122:443)
wget: server returned error: HTTP/1.1 400 Bad Request
Fixing...
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>