xdm: Changes to 'master'

[Gaetan Nadon]

 configure.ac        |   24 ++++++++++++------------
 m4/ac_define_dir.m4 |   45 ---------------------------------------------
 m4/ax_define_dir.m4 |   49 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+), 57 deletions(-)

New commits:
commit 8f85641ac03f4b55f8618edde94adcc43039bb20
Author: Gaetan Nadon <memsize at videotron.ca>
Date:   Sat Aug 21 10:20:18 2010 -0400

    config: upgrade AC_DEFINE_DIR to AX_DEFINE_DIR
    
    Use the latest version now hosted by GNU.
    The renaming protects Autoconf namespace.
    There is no functional change in the macro.
    
    Signed-off-by: Gaetan Nadon <memsize at videotron.ca>