Subject: Drop configuration that is specific to official Debian

Index: choose-mirror-2.79+deb9u1/Makefile
===================================================================
--- choose-mirror-2.79+deb9u1.orig/Makefile
+++ choose-mirror-2.79+deb9u1/Makefile
@@ -33,7 +33,7 @@ LIBS=-ldebconfclient -ldebian-installer
 STRIP=strip
 
 # Derivative distributions may want to change these.
-MIRRORLISTURL=https://salsa.debian.org/mirror-team/masterlist/raw/master/Mirrors.masterlist
+#MIRRORLISTURL=https://salsa.debian.org/mirror-team/masterlist/raw/master/Mirrors.masterlist
 MASTERLIST=Mirrors.masterlist
 
 ifdef DEBUG