build: fix typo that broke 'make dist'
build: fix typo that broke 'make dist'

Bug introduced in commit 5c6ff42; 'make dist' fails:

make[3]: Entering directory `/home/eblake/libvirt-tmp/build3/examples/python'
make[3]: *** No rule to make target `topoology.py', needed by `distdir'.  Stop.
make[3]: Leaving directory `/home/eblake/libvirt-tmp/build3/examples/python'

* examples/python/Makefile.am (EXTRA_DIST): Spell topology right.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

crobinso/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,olafhering/libvirt,jfehlig/libvirt,cbosdo/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,taget/libvirt,andreabolognani/libvirt,cbosdo/libvirt,VenkatDatta/libvirt,libvirt/libvirt,taget/libvirt,jardasgit/libvirt,rlaager/libvirt,shugaoye/libvirt,taget/libvirt,fabianfreyer/libvirt,rlaager/libvirt,libvirt/libvirt,elmarco/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,taget/libvirt,elmarco/libvirt,olafhering/libvirt,nertpinx/libvirt,zippy2/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,rlaager/libvirt,zippy2/libvirt,datto/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,jfehlig/libvirt,libvirt/libvirt,agx/libvirt,elmarco/libvirt,elmarco/libvirt,fabianfreyer/libvirt,olafhering/libvirt,crobinso/libvirt,nertpinx/libvirt,crobinso/libvirt,andreabolognani/libvirt,agx/libvirt,nertpinx/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,jfehlig/libvirt,jardasgit/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,shugaoye/libvirt,cbosdo/libvirt,eskultety/libvirt,shugaoye/libvirt,nertpinx/libvirt,nertpinx/libvirt,zippy2/libvirt,cbosdo/libvirt,taget/libvirt,fabianfreyer/libvirt,eskultety/libvirt,elmarco/libvirt,datto/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,libvirt/libvirt,VenkatDatta/libvirt,eskultety/libvirt,rlaager/libvirt,datto/libvirt,rlaager/libvirt,jfehlig/libvirt,datto/libvirt,cbosdo/libvirt,agx/libvirt,datto/libvirt