Share object files between targets is wrong!

[hugopl]

e.g.:
in meique.lua

• A executable target with main.cpp and foo.cpp

in lib/meique.lua

• A shared library target with bar.cpp and ../foo.cpp

Meique will use the same build/foo.cpp.o on both target and the link will fail because foo.cpp wasn't compiled with -fPIC or -fpic.

[hugopl]

Fixed in commit 17e2c11