scripts/config: fix segfault introduced in r43652

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 43695

scripts/config/zconf.l

@@ -14,6 +14,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <glob.h>
+#include <libgen.h>
 
 #include "lkc.h"
 

scripts/config/zconf.lex.c_shipped

@@ -777,6 +777,7 @@ char *zconftext;
 #include <string.h>
 #include <unistd.h>
 #include <glob.h>
+#include <libgen.h>
 
 #include "lkc.h"