[Cook] cook 2.27: Makefile.in buggy

[Florian Weimer]

Makefile.in contains rules like this:

c_incl/cache.$(OBJEXT): c_incl/cache.c common/ac/fcntl.h common/config.h \
		common/config.messy.h common/ac/stdio.h \
		common/ac/string.h c_incl/cache.h common/main.h \
		common/str_list.h common/str.h common/ac/stddef.h \
		common/ac/stdarg.h common/format_print.h \
		common/error_intl.h common/sub.h common/noreturn.h \
		common/mem.h c_incl/os_interface.h common/progname.h \
		common/symtab.h common/trace.h
  $(CC) -I. $(CPPFLAGS) $(CFLAGS) -c c_incl/cache.c
  mv cache.$(OBJEXT) $@

IOW, no tab at the beginning of a command line.  As a result, the
Makefile won't work.