gnu: valgrind: Enable the arm architecture during configuration.

* gnu/packages/patches/valgrind-enable-arm.patch: New file.
* gnu/packages/valgrind.scm (valgrind)[source]: Add patch.
* gnu-system.am (dist_patch_DATA): Enable patch.

gnu-system.am

@@ -647,6 +647,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/unzip-remove-build-date.patch		\
   gnu/packages/patches/util-linux-tests.patch			\
   gnu/packages/patches/upower-builddir.patch			\
+  gnu/packages/patches/valgrind-enable-arm.patch		\
   gnu/packages/patches/vpnc-script.patch			\
   gnu/packages/patches/vtk-mesa-10.patch			\
   gnu/packages/patches/w3m-fix-compile.patch			\

gnu/packages/patches/valgrind-enable-arm.patch

@@ -0,0 +1,15 @@
+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"

gnu/packages/valgrind.scm

@@ -37,7 +37,8 @@
                                  version ".tar.bz2"))
              (sha256
               (base32
-               "0hiv871b9bk689mv42mkhp76za78l5773glszfkdbpf1m1qn4fbc"))))
+               "0hiv871b9bk689mv42mkhp76za78l5773glszfkdbpf1m1qn4fbc"))
+             (patches (map search-patch '("valgrind-enable-arm.patch")))))
     (build-system gnu-build-system)
     (arguments
      '(#:phases (alist-cons-after