package/tini: needs MMU

tini uses fork(), so needs an MMU.

Fixes:
    http://autobuild.buildroot.org/results/410/410ad9ea6a6652a7db691f537acb38db279b996a/

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Matt Weber <matthew.weber@rockwellcollins.com>
Cc: Christian Stewart <christian@paral.in>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/tini/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_TINI
 	bool "tini"
+	depends on BR2_USE_MMU # fork()
 	help
 	  tini is a simple but valid init binary to
 	  act as PID 1 for containers.