build: switch to subdir objects and fix copyright information in string.c.

caca/string.c

@@ -1,6 +1,6 @@
 /*
  *  libcaca       Colour ASCII-Art library
- *  Copyright (c) 2002-2010 Sam Hocevar <sam@hocevar.net>
+ *  Copyright (c) 2002-2012 Sam Hocevar <sam@hocevar.net>
  *                All Rights Reserved
  *
  *  This library is free software. It comes without any warranty, to

configure.ac

@@ -3,7 +3,7 @@ AC_INIT(libcaca, 0.99.beta19pre)
 AC_PREREQ(2.50)
 AC_CONFIG_AUX_DIR(.auto)
 AC_CANONICAL_SYSTEM
-AM_INIT_AUTOMAKE([no-define tar-ustar])
+AM_INIT_AUTOMAKE([subdir-objects no-define tar-ustar silent-rules])
 dnl AM_MAINTAINER_MODE
 
 AM_CONFIG_HEADER(config.h)