On Ubuntu 11.10, the optimized build was breaking, apparently because
it was eliminating most of the symbols defined in assembly code
(e.g. vmJump) as unreachable when linking libjvm.so, which left
avian-dynamic unlinkable due to an unresolved symbol.
The solution in this commit is to export makeSystem and makeFinder
from libjvm.so rather than build redundant versions of finder.cpp and
posix.cpp/windows.cpp into avian-dynamic like we've been doing. This
avoids the whole problem of vmJump reachability and reduces the size
of avian-dynamic at the same time.
This commit also turns off LTO for the avian-dynamic link since we get
odd undefined symbol errors about libc-defined symbols otherwise.
This may merit future investigation, but avian-dynamic is so small and
simple that there's no need to optimize it anyway.
1c85ea8a6e