aespipe: needs mmu

Fixes:
http://autobuild.buildroot.net/results/9f3/9f3f85a024791cdc6b10e3e40cf41707eb074447/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/aespipe/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_AESPIPE
 	bool "aespipe"
+	depends on BR2_USE_MMU # fork()
 	help
 	  aespipe program is AES encrypting or decrypting pipe. It reads from
 	  standard input and writes to standard output. It can be used to