modula-2, testsuite: Make libs and interfaces consistent.

In some case the libraries list was being set before gm2_init_xxx was
called.  In some cases it was omitted - this could lead to a difference
between the link libs and the interfaces (the effect of this would be
dependent on the order in which the .exps were run, which makes it also
depend on the -j and the system).

To avoid a mismatch between the module include paths and the added libs
we now make sure that they are both added in the gm_init_xxxx functions
(if finer control over granularity is needed, then we should as a TODO
add a generic gm_init_xxx that takes a library list and ensures that the
imports and libs are matched in the same order).

Also we cannot use a default variable in tcl if the source for that
variable could be absent, but something else follows, there is no way
to put an empty placeholder in.

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

gcc/testsuite/ChangeLog:

	* gm2/complex/run/pass/complex-run-pass.exp: Remove gm2_link_lib.
	* gm2/iso/run/pass/iso-run-pass.exp: Likewise.
	* gm2/link/externalscaffold/pass/link-externalscaffold-pass.exp:
	* gm2/pimlib/logitech/run/pass/pimlib-logitech-run-pass.exp: Likewise.
	* gm2/pimlib/run/pass/pimlib-run-pass.exp: Likewise.
	* gm2/projects/iso/run/pass/halma/projects-iso-run-pass-halma.exp:
	Likewise.
	* gm2/projects/iso/run/pass/hello/projects-iso-run-pass-hello.exp:
	Likewise.
	* gm2/projects/pim/run/pass/hello/projects-pim-run-pass-hello.exp:
	Likewise.
	* gm2/sets/run/pass/sets-run-pass.exp: Likewise.
	* gm2/switches/none/run/pass/gm2-none.exp: Likewise.
	* gm2/switches/pic/run/pass/switches-pic-run-pass.exp: Likewise.
	* gm2/projects/pim/run/pass/random/projects-pim-run-pass-random.exp:
	Likewise, and also ensure that the -g option is appended to avoid it
	being taken as a path.
	* lib/gm2.exp: Ensure for each gm2_init_xxxx function that the set of
	libraries added matches the set of -I and -L options.

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