Drop definition of deprecated substitution type ksize_t.

This avoids FTBFS on FreeBSD 12.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 68f23556e6)

acinclude.m4.in

@@ -3961,8 +3961,6 @@ AC_DEFUN([AC_CHECK_SOCKLEN_T],
    fi
    AC_DEFINE_UNQUOTED(kde_socklen_t, $kde_cv_socklen_t_equiv,
                      [type to use in place of socklen_t if not defined])
-   AC_DEFINE_UNQUOTED(ksize_t, $kde_cv_socklen_t_equiv,
-                     [type to use in place of socklen_t if not defined (deprecated, use kde_socklen_t)])
 ])
 
 dnl This is a merge of some macros out of the gettext aclocal.m4