Cleaned libpcal by using configcache list

base/libpcap/libpcap.conf

@@ -28,7 +28,8 @@ hook_add postmake 5 "cp -fv pcap-int.h $root/$prefix/include/"
 
 # we need to perform some config hacking for cross compilation ... :-(
 if ! atstage native; then
-	var_append confopt " " "--with-pcap=linux --cache=./config.cache"
-	hook_add preconf 5 "echo 'ac_cv_linux_vers=2' >> ./config.cache"
+	var_append configcache ' ' 'ac_cv_linux_vers=2'
+
+	var_append confopt " " "--with-pcap=linux"
 fi