build: enable OUT_FORWARD on Windows
The out_forward plugin can be compiled and linked on Windows by now.
Just enable it.
@@ -45,7 +45,7 @@ set(FLB_OUT_BIGQUERY No)
set(FLB_OUT_COUNTER Yes)
set(FLB_OUT_ES Yes)
set(FLB_OUT_EXIT No)
-set(FLB_OUT_FORWARD No)
+set(FLB_OUT_FORWARD Yes)
set(FLB_OUT_GELF No)
set(FLB_OUT_HTTP Yes)
set(FLB_OUT_INFLUXDB No)
