CVS tadam: Fix configure.ac (use of dnl)

[FVWM CVS]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     tadam   09/08/04 04:01:22

Modified files:
        .              : configure.ac ChangeLog 

Log message:
Fix configure.ac (use of dnl)

Don't use dnl comments here -- the MALLOC change speaks for itself.