Support library C files changed to C++ with dynamic scaffold signature.

Support library C files changed to C++ with dynamic scaffold signature.

This patch moves more of the C support files in the modula-2 library
into C++ files with a dynamic scaffold signature.  It also tidied
up the interface to UnixArgs and required a rebuild of the bootstrap
tool mc.

2022-06-29  Gaius Mulley  <gaius.mulley@southwales.ac.uk>

gcc/m2/ChangeLog:

	* bnf/gm2l.bnf (BlockInfoPtr): Capitalized comment starts.
	* gm2-libs-ch/UnixArgs.cc: Rewritten from UnixArgs.c in C++
	with ctor scaffold.
	* gm2-libs-ch/dtoa.cc (M2_dtoa_init): Added correct argc,
	argv, envp parameters.  (M2_dtoa_finish) Added correct argc,
	argv, envp parameters.  (M2_dtoa_dep) New function.
	(M2_dtoa_ctor) New function.
	* gm2-libs-ch/ldtoa.cc (M2_ldtoa_init): Added correct argc,
	argv, envp parameters.  (M2_ldtoa_finish) Added correct argc,
	argv, envp parameters.  (M2_ldtoa_dep) New function.
	(M2_ldtoa_ctor) New function.
	* gm2-libs-iso/ProgramArgs.mod: Changed to use GetArgC and
	GetArgV.
	* gm2-libs/Args.def: Renamed parameter name from i to n.
	* gm2-libs/Args.mod: Changed to use GetArgC and
	GetArgV.
	* gm2-libs/SArgs.def: Renamed parameter name from i to n.
	* gm2-libs/SArgs.mod: Changed to use GetArgC and
	GetArgV.
	* gm2-libs/UnixArgs.def: Rewritten to export GetArgC, GetArgV
	and GetEnvV.
	* init/mcinit: Commented out M2Dependent.
	* mc-boot-ch/GM2LINK.c: Include cstddef.h and declare
	ForcedModuleInitOrder.
	* mc-boot-ch/GUnixArgs.cc: Rewritten in C++ from GUnixArgs.c.
	* mc-boot/GArgs.c: Rebuilt.
	* mc-boot/GArgs.h: Rebuilt.
	* mc-boot/GM2RTS.c: Rebuilt.
	* mc-boot/GM2RTS.h: Rebuilt.
	* mc-boot/GSArgs.c: Rebuilt.
	* mc-boot/GSArgs.h: Rebuilt.
	* mc-boot/GUnixArgs.h: Rebuilt.
	* mc-boot/Gdecl.c: Rebuilt.
	* mc/mc.flex: Rebuilt.

libgm2/ChangeLog:

	* libm2pim/Makefile.am (libm2pim_la_SOURCES): UnixArgs.c
	removed UnixArgs.cc added.  (libm2pim_la_SOURCES) sckt.c
	removed sckt.cc added.  (libm2pim_la_SOURCES) dtoa.c
	removed dtoa.cc added.  (libm2pim_la_SOURCES) ldtoa.c
	removed ldtoa.cc added.  (libm2pim_la_SOURCES) Selective.c
	removed Selective.cc added.
	* libm2pim/UnixArgs.cc: Rewritten in C++.
	* libm2pim/dtoa.cc: Rewritten in C++.
	* libm2pim/ldtoa.cc: Rewritten in C++.
	* libm2pim/sckt.cc: Rewritten in C++.

Signed-off-by: Gaius Mulley <gaius.mulley@southwales.ac.uk>