LibC: Add stubs for {get,free}ifaddrs

These are needed for our libuv port

userspace/libraries/LibC/ifaddrs.cpp

@@ -0,0 +1,15 @@
+#include <ifaddrs.h>
+
+#include <BAN/Assert.h>
+
+int getifaddrs(struct ifaddrs** ifap)
+{
+	(void)ifap;
+	ASSERT_NOT_REACHED();
+}
+
+void freeifaddrs(struct ifaddrs*  ifa)
+{
+	(void)ifa;
+	ASSERT_NOT_REACHED();
+}