CVS tadam: ld --as-needed compilation fixes with external libs.

[cvs]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     tadam   11/04/10 13:47:18

Modified files:
        .              : ChangeLog acinclude.m4 configure.ac 

Log message:
ld --as-needed compilation fixes with external libs.