choose-mirror: integrate udeb from debian upstream

helpers/DATA/choose-mirror/rev_Makefile.patch

@@ -0,0 +1,14 @@
+diff -ru choose-mirror-2.78ubuntu7+10.0trisquel3/Makefile choose-mirror-2.111/Makefile
+--- choose-mirror-2.78ubuntu7+10.0trisquel3/Makefile	2021-02-26 15:22:56.000000000 -0600
++++ choose-mirror-2.111/Makefile	2021-06-04 12:09:55.000000000 -0500
+@@ -33,8 +33,8 @@
+ STRIP=strip
+ 
+ # Derivative distributions may want to change these.
+-#MIRRORLISTURL=https://anonscm.debian.org/git/mirror/mirror-masterlist.git/plain/Mirrors.masterlist
+-MASTERLIST=Mirrors.masterlist.trisquel
++MIRRORLISTURL=https://salsa.debian.org/mirror-team/masterlist/raw/master/Mirrors.masterlist
++MASTERLIST=Mirrors.masterlist
+ 
+ ifdef DEBUG
+ CFLAGS:=$(CFLAGS) -DDODEBUG

helpers/DATA/choose-mirror/rev_choose-mirror-bin.templates-in.patch

@@ -0,0 +1,22 @@
+diff -ru choose-mirror-2.78ubuntu7+10.0trisquel3/debian/choose-mirror-bin.templates-in choose-mirror-2.111/debian/choose-mirror-bin.templates-in
+--- choose-mirror-2.78ubuntu7+10.0trisquel3/debian/choose-mirror-bin.templates-in	2021-02-26 15:22:56.000000000 -0600
++++ choose-mirror-2.111/debian/choose-mirror-bin.templates-in	2021-02-08 06:52:03.000000000 -0600
+@@ -12,10 +12,14 @@
+ Type: select
+ Choices-C: ${CHOICES-C}
+ Choices: ${CHOICES}
+-Default: nabia
+-Description: Trisquel version to install:
+- In Trisquel, this question is never asked, and is only for preseeding.
+- Caveat emptor.
++# :sl2:
++_Description: Debian version to install:
++ Debian comes in several flavors. Stable is well-tested and rarely changes.
++ Unstable is untested and frequently changing. Testing is a middle ground,
++ that receives many of the new versions from unstable if they are not too
++ buggy.
++ .
++ Only flavors available on the selected mirror are listed.
+ 
+ Template: mirror/codename
+ Type: string