configure: fix action expansion

enable|disable -> (enable|disable)_feature

Change-Id: I7494913c78ebe8bb532fa6545e0ae53a79ccd388
diff --git a/configure b/configure
index 1632670..a252081 100755
--- a/configure
+++ b/configure
@@ -363,7 +363,7 @@
         eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
         if echo "${EXPERIMENT_LIST}" | grep "^ *$option\$" >/dev/null; then
             if enabled experimental; then
-                $action $option
+                ${action}_feature $option
             else
                 log_echo "Ignoring $opt -- not in experimental mode."
             fi