CMake object libraries keep building with position-independent code
enabled even when it's explicitly disabled! We do, in fact, have to
build with position-independent code disabled on some targets, such as
PlayStation Vita, since some targets support position-independent code.
CMake static libraries don't seem to forcibly enable
position-independent code, so I've converted all the object libraries
into static libraries and added the new static libraries as dependencies
in Meson.
