modula-2,libgm2: Add undefined, dynamic_lookup to m2 libs links.

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.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
libgm2/ChangeLog:

	* configure: Regenerate.
	* configure.ac: Make a conditional for configurations targeting
	Darwin.
	* libm2cor/Makefile.am: Use -undefined,dynamic_lookup on Darwin.
	* libm2iso/Makefile.am: Likewise.
	* libm2log/Makefile.am: Likewise.
	* libm2pim/Makefile.am: Likewise
	* libm2min/Makefile.am: Likewise
	* libm2cor/Makefile.in: Regenerate.
	* libm2iso/Makefile.in: Regenerate.
	* libm2log/Makefile.in: Regenerate.
	* libm2min/Makefile.in: Regenerate.
	* libm2pim/Makefile.in: Regenerate.