xdm: Changes to 'master'

[Alan Coopersmith]

 .gitignore          |    5 +++++
 Makefile.am         |    1 +
 acinclude.m4        |   45 ---------------------------------------------
 auth.c              |    4 ++--
 configure.ac        |    1 +
 m4/ac_define_dir.m4 |   45 +++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 54 insertions(+), 47 deletions(-)

New commits:
commit c9cdd56df50f280e90ba95cfa933222f94ad2677
Author: Alan Coopersmith <alan.coopersmith at sun.com>
Date:   Mon Mar 15 23:34:04 2010 -0700

    Move m4 macros to m4 subdir as automake/libtool recommend
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at sun.com>

commit b9226288b96f0c5988d2c2f52718674d39803a5e
Author: Alan Coopersmith <alan.coopersmith at sun.com>
Date:   Mon Mar 15 23:21:30 2010 -0700

    Replace hardcoded NAMELEN of 14 for ancient SysV with MAXNAMELEN
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at sun.com>