libxtables: prefix/order - param_act

Changes:
	exittype -> xtables_exittype
	P_* -> XTF_* flags

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/iptables.c b/iptables.c
index 15b5b6f..9adc209 100644
--- a/iptables.c
+++ b/iptables.c
@@ -367,7 +367,7 @@
 }
 
 void
-exit_error(enum exittype status, const char *msg, ...)
+exit_error(enum xtables_exittype status, const char *msg, ...)
 {
 	va_list args;