htop: needs MMU

Fixes:
http://autobuild.buildroot.org/results/023b40f48c8006cd49c585efae3cfa065b21bf51

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/htop/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_HTOP
 	bool "htop"
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_NCURSES
 	help
 	  htop is an interactive text-mode process viewer for Linux.