Fix and refactor mirroring config
It's probably a wrong idea to mix Prague-specific mirror config with
board config, so let's keep these around but somewhere else.
Also fix them so that they actually point to a place which works...
Change-Id: If844359798be0e8d63be4ca2c526344091c943a4
diff --git a/configs/mirror.config b/configs/mirror.config
new file mode 100644
index 0000000..7d98c51
--- /dev/null
+++ b/configs/mirror.config
@@ -0,0 +1,3 @@
+BR2_KERNEL_MIRROR="http://ftp.fi.muni.cz/pub"
+BR2_GNU_MIRROR="http://ftp.fi.muni.cz/pub"
+BR2_CPAN_MIRROR="http://ftp.fi.muni.cz/pub"