use right name, typo in the copy process

diff --git a/pym/portage/util/_dyn_libs/LinkageMapXCoff b/pym/portage/util/_dyn_libs/LinkageMapXCoff.py
similarity index 100%
rename from pym/portage/util/_dyn_libs/LinkageMapXCoff
rename to pym/portage/util/_dyn_libs/LinkageMapXCoff.py