Add support for Renesas SH CPU (sh4).

This defines cl_word_alignment for sh4.
Thanks to Nobuhiro Iwamatsu <iwamatsu@nigauri.org>.

include/cln/object.h

@@ -22,7 +22,7 @@ namespace cln {
 #if defined(__m68k__)
   #define cl_word_alignment  2
 #endif
-#if defined(__i386__) || defined(__mips__) || defined(__mipsel__) || (defined(__sparc__) && !defined(__sparc64__)) || defined(__hppa__) || defined(__arm__) || defined(__rs6000__) || defined(__m88k__) || defined(__convex__) || defined(__s390__)
+#if defined(__i386__) || defined(__mips__) || defined(__mipsel__) || (defined(__sparc__) && !defined(__sparc64__)) || defined(__hppa__) || defined(__arm__) || defined(__rs6000__) || defined(__m88k__) || defined(__convex__) || defined(__s390__) || defined(__sh__)
   #define cl_word_alignment  4
 #endif
 #if defined(__alpha__) || defined(__ia64__) || defined(__mips64__) || defined(__powerpc64__) || defined(__sparc64__) || defined(__x86_64__)