drop HACKING from doxygen

I tried just fixing the code to pull in HACKING.md but it didn't show
up in the doxygen output; it's maybe too long to include anyway.

diff --git a/configure.py b/configure.py
index 85661b7270375eed0f49f8fb1f204e6d1906eb9a..e4b9eb45e812edab54119a98de4c995dc551d735 100755 (executable)
--- a/configure.py
+++ b/configure.py
@@ -407,7 +407,7 @@ n.rule('doxygen_mainpage',
        command='$doxygen_mainpage_generator $in > $out',
        description='DOXYGEN_MAINPAGE $out')
 mainpage = n.build(built('doxygen_mainpage'), 'doxygen_mainpage',
-                   ['README', 'HACKING', 'COPYING'],
+                   ['README', 'COPYING'],
                    implicit=['$doxygen_mainpage_generator'])
 n.build('doxygen', 'doxygen', doc('doxygen.config'),
         implicit=mainpage)