event: add unistd header

The file uses `write` which is defined in `unistd.h`.  Add it to give
more coverage to various compiler and stdlib versions.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Icbef43f3b6b89f0ff3cdfb84ad5fa1c695562dbb
diff --git a/src/event.cpp b/src/event.cpp
index badd43a..209bac6 100644
--- a/src/event.cpp
+++ b/src/event.cpp
@@ -1,4 +1,5 @@
 #include <sys/eventfd.h>
+#include <unistd.h>
 
 #include <sdbusplus/event.hpp>
 #include <sdbusplus/exception.hpp>