Add (in comments) the workarounds in ESA's network

OAR/contrib/build.rtems.4.12.sh

@@ -67,8 +67,11 @@ BUILD_LOG=~/rtems.build.logs/${DATE}.log
     # [ ! -d sources ] && {
     #     mkdir -p sources
     #     cd sources
-    #     cp -al ~/development/rtems/pkg_sources/* .
+    #     cp -al ~/development/rtems/pkg_sources_cache/* .
     #     cd ..
+    #     for i in config/tools/*cfg ; do
+    #         cat "$i" | sed 's,ftp://ftp.gnu.org,http://ftp.gnu.org,;s,ftp://gcc.gnu.org,http://gcc.gnu.org,;' > "$i".new && mv "$i".new "$i"
+    #     done
     # }
 
     # Build the cross compiler