modula-2,libgm2: Add undefined, dynamic_lookup to m2 libs links.
The libm2 libraries are cross-linked, which means that we need to allow
symbols to be undefined at link time and then to be found at runtime.
This is implemented on Darwin by adding -undefined, dynamic_lookup to
the link command.
NOTE: It would probably be a better solution to rework the libraries
either to combine those that have inter-dependencies, or to reorder
the layering so the there is a fixed dependency tree.
git://gcc.gnu.org / gcc.git / commit