perl 5.8.8: Don't set LD_LIBRARY_PATH when running miniperl. This was being

perl 5.8.8: Don't set LD_LIBRARY_PATH when running miniperl. This was being
set to point at the current perl build to find the shared perl library,
however in the OE case we actually want the staged native version not those
that belong to the build for the target. The miniperl binary actually has an
rpath pointing at the staging dir so no LD_LIBRARY_PATH is required. It
seems gentoo has started letting LD_LIBRARY_PATH override rpath which is
breaking the perl build. Should solve part of #2483 and other irc reports of
problems.