Fixes for Hurd build

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/applets/applet_tables.c b/applets/applet_tables.c
index ce20374..7ba929b 100644
--- a/applets/applet_tables.c
+++ b/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"