Fix convertDoubleToWakeTime warning.

src/libCom/osi/os/posix/osdEvent.c

@@ -25,6 +25,7 @@
 #include "epicsTime.h"
 #include "errlog.h"
 #include "epicsAssert.h"
+#include "osdTime.h"
 
 /* Until these can be demonstrated to work leave them undefined*/
 #undef _POSIX_THREAD_PROCESS_SHARED