Fix memstrike component's build profile.

Before the git command did not really checkout
the requested revision because of the *.

component/memstrike/buildout.cfg

@@ -31,6 +31,4 @@ command =
   rm -rf ${:location} &&
   ${git:location}/bin/git clone --quiet git://github.com/frsyuki/memstrike.git ${:location} &&
   cd ${:location} &&
-  ${git:location}/bin/git checkout --quiet ${:revision} *
-update-command =
-  echo "Nothing to update"
+  ${git:location}/bin/git checkout --quiet ${:revision}