BUG/MEDIUM: lua: the Lua process is not waked up after sending data on requests side

If we are writing in the request buffer, we are not waked up
when the data are forwarded because it is useles. The request
analyzers are waked up only when data is incoming. So, if the
request buffer is full, we set the WAKE_ON_WRITE flag.
diff --git a/include/types/hlua.h b/include/types/hlua.h
index 5a3dddb..a385c02 100644
--- a/include/types/hlua.h
+++ b/include/types/hlua.h
@@ -19,6 +19,7 @@
 #define HLUA_RUN       0x00000001
 #define HLUA_CTRLYIELD 0x00000002
 #define HLUA_WAKERESWR 0x00000004
+#define HLUA_WAKEREQWR 0x00000008
 
 enum hlua_exec {
 	HLUA_E_OK = 0,