configure.in: Prune nonexistent files from build_xm_file, xm_file, and host_xm_file lists.
* configure.in: Prune nonexistent files from build_xm_file,
xm_file, and host_xm_file lists. Warn unless they're
$cpu/xm-$cpu.h.
Don't generate *config.h here.
AC_SUBST all variables needed to generate *config.h.
* configure: Regenerate.
* mkconfig.sh: New helper script, from code removed from
configure.in.
* Makefile.in: Zap all MALLOC variables - no longer used
anywhere, and malloc.c doesn't exist.
Substitute in variables needed to generate *config.h.
Stop lying about the dependencies contained in CONFIG_H and
GCONFIG_H.
(HCONFIG_H, TCONFIG_H, TM_P_H): New variables.
(config.h, hconfig.h, tconfig.h, tm_p.h, cs-config.h,
cs-hconfig.h, cs-tconfig.h, cs-tm_p.h): New rules.
(all .o): Add dependencies on $(HCONFIG_H), $(TCONFIG_H),
$(TM_P_H), etc. as appropriate.
* config.gcc: Zap references to deleted files.
* ggc-none.c: Don't include rtl.h or tm_p.h.