CLEANUP: proxy: Remove the flag PR_O2_USE_HTX
This flag is now unused. So we can safely remove it.
diff --git a/include/types/proxy.h b/include/types/proxy.h
index ca24dbf..55afed7 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -152,7 +152,7 @@
#define PR_O2_SRC_ADDR 0x00100000 /* get the source ip and port for logs */
#define PR_O2_FAKE_KA 0x00200000 /* pretend we do keep-alive with server eventhough we close */
-#define PR_O2_USE_HTX 0x00400000 /* use the HTX representation for the HTTP protocol */
+/* unused : 0x00400000 */
#define PR_O2_EXP_NONE 0x00000000 /* http-check : no expect rule */
#define PR_O2_EXP_STS 0x00800000 /* http-check expect status */