* configure.in: Check for setpgid function.

	* configure.in: Check for setpgid function.
	* config.in: Regenerate with autoheader.
	* configure: Regenerate with autoconf.
	* inflow.c (_initialize_inflow): Only try to use _SC_JOB_CONTROL
	if it is actually defined.
	(gdb_setpgid): Use HAVE_SETPGID.
	* ch-exp.c: Change include of <string.h> to "gdb_string.h".
	* c-exp.y: Ditto.
	* f-exp.y: Ditto.
	* m2-exp.y: Ditto.
	* c-exp.y: Include <ctype.h>.
	* serial.c: Ditto.
	* config/m68k/nm-news.h: Add typedef for pid_t which is
	apparently missing from <sys/types.h>.  Enclose entire
	file in NM_NEWS_H ifndef and define when included.
	* config/mips/nm-news-mips.h: Ditto.
	* config/m68k/tm-m68k.h (REGISTER_CONVERT_TO_VIRTUAL,
	REGISTER_CONVERT_TO_RAW): Change name of temporary variable.