use a mirror for CyanogenMod's repos

Signed-off-by: Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>

default.xml

@@ -6,8 +6,8 @@
            review="android-review.googlesource.com"
            revision="refs/tags/android-6.0.1_r10" />
 
-  <remote  name="github"
-           fetch="https://github.com/"
+  <remote  name="cm-mirror"
+           fetch="https://code.fossencdi.org/cm-mirror/"
            review="review.cyanogenmod.org" />
 
   <remote name="fossencdi"
@@ -20,7 +20,7 @@
            fetch="ssh://git@github.com" />
 
   <default revision="refs/heads/cm-13.0"
-           remote="github"
+           remote="cm-mirror"
            sync-c="true"
            sync-j="4" />