meta-ibm: witherspoon: mboxd: set version wildcard

Set the wildcard for version for mboxd_%.bbappend

Change-Id: Ic68a2365b068ec55414273d8322189485c609dde
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/meta-witherspoon/recipes-phosphor/mboxd/mboxd_%.bbappend b/meta-witherspoon/recipes-phosphor/mboxd/mboxd_%.bbappend
new file mode 120000
index 0000000..02277c4
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/mboxd/mboxd_%.bbappend
@@ -0,0 +1 @@
+mboxd.bbappend
\ No newline at end of file