sdevent: Add dependency on stdplus

An upcoming change will require stdplus as a new dependency

(From meta-phosphor rev: eceabb734b586759e70a73fde40d9bccc390c089)

Change-Id: I75f6d0e4c49851819c3ac2eb025a1a5b1ab27564
Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-extended/sdeventplus/sdeventplus_git.bb b/meta-phosphor/recipes-extended/sdeventplus/sdeventplus_git.bb
index 63b0920..28b3b56 100644
--- a/meta-phosphor/recipes-extended/sdeventplus/sdeventplus_git.bb
+++ b/meta-phosphor/recipes-extended/sdeventplus/sdeventplus_git.bb
@@ -10,6 +10,7 @@
 
 DEPENDS += " \
         autoconf-archive-native \
+        stdplus \
         systemd \
         "