added missing epicsShareDef (should impact only the VAX)

src/include/caerr.h

@@ -166,7 +166,7 @@ HDRVERSIONID(caerrh, "@(#) $Id$")
 #ifndef CA_ERROR_GLBLSOURCE
 epicsShareExtern READONLY char	*ca_message_text[];
 #else
-READONLY char	*ca_message_text[]
+epicsShareDef READONLY char	*ca_message_text[]
 =
 {
 "Normal successful completion",