qemu: disable Valgrind

Qemu has an automatic dependency on valgrind which cannot be disabled, which
causes non-deterministic builds and build failures.  As Valgrind wasn't enabled
previously make this deterministic by forcibly disabling it.

(From OE-Core rev: 33960902b9c36575ddda3d926d70fa13bbad85f6)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu/no-valgrind.patch

@@ -0,0 +1,19 @@
+There isn't an option to enable or disable valgrind support, so disable it to avoid non-deterministic builds.
+
+Upstream-Status: Inappropriate
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+diff --git a/configure b/configure
+index b3c4f51..4d3929e 100755
+--- a/configure
++++ b/configure
+@@ -4193,9 +4192,0 @@ valgrind_h=no
+-cat > $TMPC << EOF
+-#include <valgrind/valgrind.h>
+-int main(void) {
+-  return 0;
+-}
+-EOF
+-if compile_prog "" "" ; then
+-    valgrind_h=yes
+-fi

meta/recipes-devtools/qemu/qemu_2.4.0.bb

@@ -9,6 +9,7 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
             file://smc91c111_fix1.patch \
             file://smc91c111_fix2.patch \
             file://smc91c111_fix3.patch \
+            file://no-valgrind.patch \
            "
 SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
 SRC_URI[md5sum] = "186ee8194140a484a455f8e3c74589f4"