qemu: remove ATTRIBUTE_UNUSED in qemuProcessHandleMonitorEOF
qemu: remove ATTRIBUTE_UNUSED in qemuProcessHandleMonitorEOF

This attribute is not needed here, since @mon is in use.

Signed-off-by: Marc Hartmayer <7bafc8cd4e6394916d396e4f8cde69753be8d066@linux.vnet.ibm.com>
Reviewed-by: Bjoern Walk <40545c009452f40d2ae0bbfbd987b332d274d328@linux.vnet.ibm.com>

jfehlig/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jfehlig/libvirt,datto/libvirt,andreabolognani/libvirt,crobinso/libvirt,eskultety/libvirt,datto/libvirt,datto/libvirt,jardasgit/libvirt,libvirt/libvirt,VenkatDatta/libvirt,olafhering/libvirt,crobinso/libvirt,eskultety/libvirt,crobinso/libvirt,zippy2/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,VenkatDatta/libvirt,eskultety/libvirt,olafhering/libvirt,jardasgit/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,libvirt/libvirt,VenkatDatta/libvirt,datto/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,jardasgit/libvirt,datto/libvirt,zippy2/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jardasgit/libvirt,andreabolognani/libvirt,zippy2/libvirt,libvirt/libvirt,nertpinx/libvirt,nertpinx/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt