Add missing declarations to gcc/m2/gm2-libs-min/M2RTS.{def,mod}

Add missing declarations to gcc/m2/gm2-libs-min/M2RTS.{def,mod}

This patch adds two missing procedures to
gcc/m2/gm2-libs-min/M2RTS.{def,mod} required for linking.  The
patch also includes test code, changes to
gcc/testsuite/lib/gm2.exp and an expect tcl script to test the
min libraries.

gcc/m2/ChangeLog:

	* gm2-libs-min/M2RTS.def (ConstructModules): New procedure
	declaration.
	(DeconstructModules): New procedure declaration.
	* gm2-libs-min/M2RTS.mod (ConstructModules): New procedure
	dummy implementation.
	(DeconstructModules): New procedure dummy implementation.

gcc/testsuite:

	* lib/gm2.exp (gm2_init_minx): New procedure.
	(gm2_init_min): New procedure calls gm2_init_min with
	dialect flags.
	* gm2/link/min/pass/tiny.mod: New test case.
	* gm2/link/min/pass/link-min-pass.exp: New file.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>