add defs for C++

src/libCom/osi/os/vxWorks/epicsDynLink.h

@@ -23,6 +23,11 @@
 #include "vxWorks.h"
 #include "symLib.h"
 #include "sysSymTbl.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
  
 STATUS symFindByNameEPICS( 
 	SYMTAB_ID symTblId,
@@ -38,5 +43,9 @@ STATUS symFindByNameAndTypeEPICS(
 	SYM_TYPE  sType,
 	SYM_TYPE  mask);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ifdef epicsDynLinkh */