Make gdbreplay use more common routines

This makes gdbreplay share a bit more code with gdbserver, and paves
the way to share more in future.  Including common-defs.h pulls in
defines and headers that gdb and gdbserver assume are always
defined/available too, such as for example _(), ansidecl.h or a set of
system headers.  Including that revealed (static vs extern conflict)
gdbreplay had a local copy of perror_with_name (which exited directly
instead of throwing an error).  So I removed gdbreplay's local copy,
and then added enough .o files until gdbreplay linked successfully.

Also, use xstrdup instead of strdup.

gdb/gdbserver/ChangeLog:
2018-06-08  Pedro Alves  <palves@redhat.com>

	* Makefile.in (GDBREPLAY_OBS): Add common/cleanups.o,
	common/common-exceptions.o, common/common-utils.o,
	common/errors.o, common/print-utils.o and utils.o.
	* gdbreplay.c: Include "common-defs.h" instead of the two
	'config.h's here.  Don't include stdio.h, errno.h, stdlib.h,
	string.h or alloca.h.
	(perror_with_name): Delete.
	(remote_open): Use xstrdup instead of strdup.
	(main): Rename to ...
	(captured_main): ... this.
	(main): New.

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