debian: Use https for upstream URLs

tukaani.org once didn't support TLS, but nowadays it does.  Use the
https URL so that people clicking it get better privacy and integrity
support.  The latter is especially important for the website of a
project like this so that people don't download tampered code.
diff --git a/debian/changelog b/debian/changelog
index 659e2ac..f9f41ad 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,9 +2,13 @@
 
   * New upstream release.  Closes: #851615.
   * Drop patches; all were applied or otherwise fixed upstream.
-  * debian/control: Use a stable repo.or.cz URL for packaging repo.
-    Closes: #826382.  Thanks to Rolf Leggewie.
-  * No longer Build-Depends: freebsd-glue on kfreebsd.
+  * debian/control:
+    - Use a stable repo.or.cz URL for packaging repo.
+      Closes: #826382.  Thanks to Rolf Leggewie.
+    - Use https for upstream homepage URL.
+    - No longer Build-Depends: freebsd-glue on kfreebsd.
+  * copyright: Use https for upstream URLs.
+  * get-orig-source: Use https for upstream Git repository.
   * liblzma:
     - Remove compatibility tricks that permit sharing a process with
       liblzma.so.2.  This means liblzma.a no longer depends on libdl
diff --git a/debian/control b/debian/control
index 661e79e..fc22bb0 100644
--- a/debian/control
+++ b/debian/control
@@ -11,7 +11,7 @@
 Standards-Version: 3.9.3
 Vcs-Browser: https://repo.or.cz/w/xz/debian
 Vcs-Git: https://repo.or.cz/r/xz/debian
-Homepage: http://tukaani.org/xz/
+Homepage: https://tukaani.org/xz/
 
 Package: liblzma5
 Section: libs
diff --git a/debian/copyright b/debian/copyright
index 3327901..55c10c8 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -2,10 +2,10 @@
 Upstream-Name: XZ Utils
 Upstream-Contact:
  Lasse Collin <lasse.collin@tukaani.org>
- http://tukaani.org/xz/lists.html
+ https://tukaani.org/xz/lists.html
 Source:
- http://tukaani.org/xz
- http://git.tukaani.org/xz.git
+ https://tukaani.org/xz
+ https://git.tukaani.org/xz.git
 Comment:
  XZ Utils is developed and maintained upstream by Lasse Collin.  Major
  portions are based on code by other authors; see AUTHORS for details.
diff --git a/debian/rules b/debian/rules
index 6033114..47a4d63 100755
--- a/debian/rules
+++ b/debian/rules
@@ -140,7 +140,7 @@
 
 # Build a tarball with the latest upstream version.
 # This is made complicated by the need to choose a nice version number.
-REPO = http://git.tukaani.org/xz.git
+REPO = https://git.tukaani.org/xz.git
 BRANCH = master
 get-orig-source:
 	mkdir debian-orig-source