stress: disable documentation

It fails to build with my makeinfo version. Note that the autobuilders don't
see this, probably because they don't have makeinfo installed.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/stress/stress.mk

@@ -17,7 +17,10 @@ STRESS_AUTORECONF = YES
 #
 # If the BR2_PREFER_STATIC_LIB is not defined, we have to specify
 # --disable-static explicitly to get stress linked dynamically.
+#
+# Also, disable documentation by undefining makeinfo
 STRESS_CONF_OPT = \
-	$(if $(BR2_PREFER_STATIC_LIB),,--disable-static)
+	$(if $(BR2_PREFER_STATIC_LIB),,--disable-static) \
+	MAKEINFO=:
 
 $(eval $(autotools-package))