Add scripts directory

Move build and user scripts into scripts directory.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/gdbstub.h b/gdbstub.h
index ce5fdcc..d82334f 100644
--- a/gdbstub.h
+++ b/gdbstub.h
@@ -38,7 +38,7 @@
 int gdbserver_start(const char *port);
 #endif
 
-/* in gdbstub-xml.c, generated by feature_to_c.sh */
+/* in gdbstub-xml.c, generated by scripts/feature_to_c.sh */
 extern const char *const xml_builtin[][2];
 
 #endif