Reworked C-alignment check to be clear-as-day.

See bug/pull discussions
 - http://code.google.com/p/memcached/issues/detail?id=100
 - memcached#3
 - http://code.google.com/p/memcached/issues/detail?id=360

Conflicts:
	configure.ac

Author: emcconville

configure.ac

@@ -493,15 +493,18 @@ AC_DEFUN([AC_C_ALIGNMENT],
        *ptr = 0x1;
 
        // catch unaligned word access (ARM cpus)
-       *buf =  1; *(buf +1) = 2; *(buf + 2) = 2; *(buf + 3) = 3; *(buf + 4) = 4;
-       int* i = (int*)(buf+1);
-       return (
 #ifdef ENDIAN_BIG
-                0x02030405
+#define ALIGNMENT 0x02030405
 #else
-                0x05040302
+#define ALIGNMENT 0x05040302
 #endif
-                        == *i) ? 0 : 1;
+       *(buf + 0) = 1;
+       *(buf + 1) = 2;
+       *(buf + 2) = 3;
+       *(buf + 3) = 4;
+       *(buf + 4) = 5;
+       int* i = (int*)(buf+1);
+       return (ALIGNMENT == *i) ? 0 : 1;
     ])
   ],[
     ac_cv_c_alignment=none