git: openjdk/jdk: 8317357: Update links in building.md to use https rather than http

Fri Nov 17 12:09:09 UTC 2023

Changeset: 9194d2c7
Author:    Magnus Ihse Bursie <ihse at openjdk.org>
Date:      2023-11-17 12:06:55 +0000
URL:       https://git.openjdk.org/jdk/commit/9194d2c71410c377aa70372dc4f51235f6ba967c

8317357: Update links in building.md to use https rather than http

Reviewed-by: iris, erikj, jwaters

! doc/building.html
! doc/building.md