fan-ctrl: mark as broken until SourceForge is back up

SourceForge is down, so we can't download fan-ctrl.c anymore, and it's
not on sources.buildroot.net nor anywhere else on the Internet
apparently. So let's mark this not-so-important package as broken for
now, until SourceForge goes back to life.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/fan-ctrl/Config.in

@@ -1,6 +1,9 @@
 config BR2_PACKAGE_FAN_CTRL
 	bool "fan-ctrl"
 	depends on BR2_USE_MMU # fork()
+	# SourceForge is down, not backup location, let's disable for
+	# now.
+	depends on BR2_BROKEN
 	help
 	  Fan-ctrl is a little daemon that controls the speed of one
 	  or more system or CPU fans. It does so by monitoring