Remove HAVE_MEMCPY ifdefs

memcpy(3) has been in standard C since C89.  It is also in
POSIX.1-2001, in SVr4, and in 4.3BSD (see memcpy(3) and memcpy(3p)).
We can assume that this function is always available.

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

libmisc/getdate.y

@@ -61,7 +61,7 @@
 /* Some old versions of bison generate parsers that use bcopy.
    That loses on systems that don't provide the function, so we have
    to redefine it here.  */
-#if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy)
+#if !defined (HAVE_BCOPY) && !defined (bcopy)
 # define bcopy(from, to, len) memcpy ((to), (from), (len))
 #endif