fan-ctrl: re-enable package

SourceForge is working again, and Peter has copied the file to
fan-ctrl.c on sources.buildroot.org so that it gets found if
SourceForge breaks again. Therefore this commit re-enables the
fan-ctrl package.

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

package/fan-ctrl/Config.in

@@ -1,9 +1,6 @@
 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