Config.in: switch GNU mirrors URL to https
As explained on [1], the primary GNU mirrors URL is https.
This commit updates BR2_GNU_MIRROR to switch to it.
[1] https://www.gnu.org/prep/ftp.html
Signed-off-by: Julien Olivain <ju.o@free.fr>
Reviewed-by: Vincent Jardin <vjardin@free.fr>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
(cherry picked from commit 0f9da3934b9fc1425db49526ab7735a601ac1edb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Julien Olivain