sdevent: Add dependency on stdplus

An upcoming change will require stdplus as a new dependency

Change-Id: Iaa228b168b6bb7fd61d70d710114a0600c776534
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/recipes-extended/sdeventplus/sdeventplus_git.bb b/recipes-extended/sdeventplus/sdeventplus_git.bb
index 63b0920..28b3b56 100644
--- a/recipes-extended/sdeventplus/sdeventplus_git.bb
+++ b/recipes-extended/sdeventplus/sdeventplus_git.bb
@@ -10,6 +10,7 @@
 
 DEPENDS += " \
         autoconf-archive-native \
+        stdplus \
         systemd \
         "