io CHANGE add partial message timeout

Meaning timeout if a full message is not
received for too long.
diff --git a/src/config.h.in b/src/config.h.in
index e0e997c..172de9a 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -31,4 +31,9 @@
  */
 #define SCHEMAS_DIR "@CMAKE_INSTALL_PREFIX@/@DATA_INSTALL_DIR@"
 
+/*
+ * Partial message read timeout in seconds
+ */
+#define NC_READ_TIMEOUT @READ_TIMEOUT@
+
 #endif /* NC_CONFIG_H_ */