A build with gcc (GCC) 4.9.2 20141101 (Red Hat 4.9.2-1) for 32-bit x86
fails because of these undefined symbols:

> nm --demangle workdir/CxxObject/svx/source/fmcomp/fmgridif.o | grep
 \\bWindowListenerMultiplexer::acquire
         U non-virtual thunk to WindowListenerMultiplexer::acquire()

They should probably be generated inline.  Work around by out-lining the
definition of the methods.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64812

Change-Id: I318f7c39bdf1243be385bc6dc0a47862b22e92c5