Fixes for Hurd build

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

applets/applet_tables.c

@@ -20,6 +20,10 @@
 #undef ARRAY_SIZE
 #define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))
 
+#ifndef PATH_MAX
+#define PATH_MAX 1024
+#endif
+
 #include "../include/autoconf.h"
 #include "../include/applet_metadata.h"
 

libbb/die_if_bad_username.c

@@ -8,6 +8,10 @@
  */
 #include "libbb.h"
 
+#ifndef LOGIN_NAME_MAX
+#define LOGIN_NAME_MAX 256
+#endif
+
 /* To avoid problems, the username should consist only of
  * letters, digits, underscores, periods, at signs and dashes,
  * and not start with a dash (as defined by IEEE Std 1003.1-2001).