CVS griph: fix detection of non-ICCCM2 WMs (bug 3151)

[FVWM CVS]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     griph   06/01/28 11:01:09

Modified files:
        .              : NEWS ChangeLog 
        fvwm           : fvwm.c 

Log message:
fix detection of non-ICCCM2 WMs (bug 3151)