package/util-linux: minix needs MMU

Fixes:
 - http://autobuild.buildroot.org/results/87801e1a3c628e00ccb0c57afc2b46cc735c6018

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Tested-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 97fc2cb9c7732f99ab42438e782318f0607a8721)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/util-linux/Config.in

@@ -217,6 +217,7 @@ config BR2_PACKAGE_UTIL_LINUX_MESG
 
 config BR2_PACKAGE_UTIL_LINUX_MINIX
 	bool "minix"
+	depends on BR2_USE_MMU # fork()
 	help
 	  Minix filesystem support