Accept "arm" instead of "armv7" in configure, see
   http://valgrind.10908.n7.nabble.com/building-for-arm-td39382.html .

diff -u -r valgrind-3.11.0.orig/configure valgrind-3.11.0/configure
--- valgrind-3.11.0.orig/configure	2015-10-02 20:37:41.915721386 +0200
+++ valgrind-3.11.0/configure	2015-10-02 20:37:54.886746395 +0200
@@ -5607,7 +5607,7 @@
         ARCH_MAX="s390x"
         ;;
 
-     armv7*)
+     arm*)
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ok (${host_cpu})" >&5
 $as_echo "ok (${host_cpu})" >&6; }
 	ARCH_MAX="arm"
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