Let iocLofDisable be dynamically changed

src/libCom/logClient/logClient.c

@@ -219,6 +219,7 @@ LOCAL void logClientSendMessageInternal (logClientId id, const char *message)
     logClient *pClient = (logClient *) id;
     int status;
     
+    if (iocLogDisable) return;
     if (!message || *message==0) {
         return;
     }

src/libCom/logClient/logClient.h

@@ -15,6 +15,8 @@
  *      Date:           080791 
  */
 
+#ifndef INClogClienth
+#define INClogClienth 1
 #include "shareLib.h"
 
 #ifdef __cplusplus
@@ -37,3 +39,4 @@ epicsShareFunc void epicsShareAPI iocLogShow (unsigned level);
 }
 #endif
 
+#endif /*INClogClienth*/