[4.1] 10e4a12 Enable make clean target in man/

[Lasse Karstensen]

commit 10e4a12ad7df8ee277d662e59a5b2e1cf10f5991
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Tue Mar 29 15:50:51 2016 +0200

    Enable make clean target in man/

diff --git a/man/Makefile.am b/man/Makefile.am
index 35a8c52..0c93e1b 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -17,7 +17,7 @@ dist_man_MANS = \
 	vmod_directors.3 \
 	vmod_std.3
 
-MAINTAINERCLEANFILES = $(dist_man_MANS)
+CLEANFILES = $(dist_man_MANS)
 
 RST2ANY_FLAGS = --halt=2