* configure.in: Move check for unsigned enumerated bitfields
	to macro in aclocal.m4.  Disable it for now.
	* configure, config.in: Regenerate.
	* system.h: Don't do anything with ONLY_INT_FIELDS.  Use the
	unsigned-int form of ENUM_BITFIELD() unless being compiled by GCC.
	* varasm.c (struct rtx_const): Use ENUM_BITFIELD().  Move enum
	kind above its first use.

	* config/xm-interix.h, config/alpha/xm-alpha.h,
	config/i370/xm-linux.h, config/i386/xm-beos.h,
	config/i386/xm-mingw32.h, config/mips/xm-mips.h,
	config/pa/xm-pa.h, config/pa/xm-pa64hpux.h,
	config/rs6000/xm-beos.h, config/rs6000/xm-sysv4.h,
	Don't define ONLY_INT_FIELDS under any circumstances.

	* config/pa/xm-pa.h: Don't define __BSD_NET2__.

	* config/pa/xm-pahpux.h, config/pa/xm-papro.h,
	config/sparc/xm-sysv4.h: Delete - now identical with some
	other xm header.
	* config.gcc (hppa targets): Replace xm-pahpux.h and
	xm-papro.h with implicit xm-pa.h.
	(sparc targets): Replace xm-sysv4.h with implicit or explicit
	xm-sparc.h.

From-SVN: r40399