CVS griph: fix tempfile vulnerabilities in FvwmCommand (bug #2791).

[FVWM CVS]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     griph   06/07/11 10:16:09

Modified files:
        .              : ChangeLog NEWS configure.ac 
        modules        : ChangeLog 
        modules/FvwmCommand: FvwmCommand.1.in FvwmCommand.c 
                             FvwmCommandS.c fifos.c 

Log message:
fix tempfile vulnerabilities in FvwmCommand (bug #2791).