Create prototype for IPC_CREATE macro on linux,

and change return type to pointer.

c_micasacache/sscs_ipc.c

@@ -34,7 +34,8 @@ int firstReadAfterWrite = 0;
  */
 
 #ifdef SSCS_LINUX_PLAT_F
-int ipc_unx_create()
+void* ipc_unx_create()
+
 {
     int retVal = 0;
     struct sockaddr_un servAddr;
@@ -63,7 +64,7 @@ int ipc_unx_create()
         else
             retVal = sockFd;
     }while(0);
-    return retVal;
+    return (void*)retVal;
 }
 
 #else