PR modula2/127359: Bugfix ensure makeSystem is posix compliant

This patch ensures that echo is replaced by equivalent printf
posix commands.  The invocation of makeSystem from the Makefiles
under libgm2 are achieved through $(SHELL).

gcc/m2/ChangeLog:

	PR modula2/127359
	* tools-src/makeSystem: Replace echo with printf equivalent.

libgm2/ChangeLog:

	PR modula2/127359
	* libm2cor/Makefile.am: Use $(SHELL) to invoke makeSystem.
	* libm2iso/Makefile.am: Ditto.
	* libm2min/Makefile.am: Ditto.
	* libm2pim/Makefile.am: Ditto.
	* libm2pim/Makefile.in:	Rebuild.
	* libm2cor/Makefile.in:	Ditto.
	* libm2iso/Makefile.in:	Ditto.
	* libm2min/Makefile.in:	Ditto.

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