Our old toolchain doesn't have utmpx.h, we suck.

--- a/lib/portability.h
+++ b/lib/portability.h
@@ -218,7 +218,7 @@ ssize_t getline(char **lineptr, size_t *n, FILE *stream);
 #if CFG_TOYBOX_SHADOW
 #include <shadow.h>
 #endif
-#if CFG_TOYBOX_UTMPX
+#if 0 //CFG_TOYBOX_UTMPX
 #include <utmpx.h>
 #else
 struct utmpx {int ut_type;};