[PATCH] readd AM_MAINTAINER_MODE, but enable maintainer mode by default

Using AM_MAINTAINER_MODE([enable]) means you get the maintainer-specific
parts enabled by default like without AM_MAINTAINER_MODE, while
people still can do --disable-maintainer-mode to avoid any pitfalls.
---
 configure.ac |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure.ac b/configure.ac
index defb3de..de6bde2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,8 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([src/main.c])
 AM_INIT_AUTOMAKE([-Wall -Werror gnu])
 
+AM_MAINTAINER_MODE([enable])
+
 AC_CONFIG_HEADER(src/config.h)
 
 dnl by default turn off debugging
-- 
1.7.10.4