package/igmpproxy: uses fork, needs mmu

Fixes
http://autobuild.buildroot.net/results/4ee/4ee081212614d86a3b2b74274f38825f7a5b3f6f/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/igmpproxy/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_IGMPPROXY
 	bool "igmpproxy"
+	depends on BR2_USE_MMU # fork()
 	depends on BR2_USE_WCHAR
 	help
 	  A simple dynamic Multicast Routing Daemon
@@ -10,4 +11,5 @@ config BR2_PACKAGE_IGMPPROXY
 	  http://sourceforge.net/projects/igmpproxy/
 
 comment "igmpproxy needs a toolchain w/ wchar"
+	depends on BR2_USE_MMU
 	depends on !BR2_USE_WCHAR