Merge branch 'kk/maint-prefix-in-config-mak' into maint

* kk/maint-prefix-in-config-mak:
  config.mak.in: allow "configure --sysconfdir=/else/where"

Author: gitster

config.mak.in

@@ -18,6 +18,7 @@ bindir = @bindir@
 gitexecdir = @libexecdir@/git-core
 datarootdir = @datarootdir@
 template_dir = @datadir@/git-core/templates
+sysconfdir = @sysconfdir@
 
 mandir=@mandir@