Log Message:
Update to xprop-1.0.4.  Changes:

commit 427023df02bd38ff9dc2af2a2059466f37f4cfd8
Date:   Wed Dec 19 15:17:34 2007 +1030

    Fix build under autoconf 2.57

    configure.ac specifies a max version of 2.57 but AC_CHECK_HEADERS_ONCE
    was only introduced to autoconf in 2.59c.
    Drop the _ONCE to make autoconf happy

commit e09956f244099ddd36b1a2cd5d7800d5fc7120c1
Date:   Thu Dec 6 05:30:43 2007 -0500

    Select correct client window in WMs using virtual roots