autoconf 2.54: missing quote in AC_HEADER_TIOCGWINSZ

[Karl Berry]

Stephen Gildea reported this Autoconf bug to me (since he found it while
working on Texinfo):

    In configure, line 3959 is this:

    if test $ac_cv_sys_tiocgwinsz_in_termios_h != yes; then

    That variable name should have double-quotes around it.  On NT with
    cygwin I got the error:

    ./configure: test: !=: unary operator expected

All Texinfo's configure.ac says is
AC_HEADER_TIOCGWINSZ

I don't know what the original source file is to fix this, but it should
be easy, at least.

There are a number of other places in the configure script where the
args to test are not quoted (see below, fyi).  I don't know why this
particular one caused the error under cygwin and not the others.

Thanks,
karl

52 lines matching "test \\$" in buffer configure/src/texinfo/u.
 1323:          if test $ac_prog = install &&
 1327:          elif test $ac_prog = install &&
 1858:if test $ac_prog_rejected = yes; then
 1862:  if test $# != 0; then
 2216:GCC=`test $ac_compiler_gnu = yes && echo yes`
 2261:elif test $ac_cv_prog_cc_g = yes; then
 2847:if test $ac_cv_c_compiler_gnu = yes; then
 2869:  if test $ac_cv_prog_gcc_traditional = no; then
 2886:  if test $ac_cv_prog_gcc_traditional = yes; then
 2926:          if test $ac_prog = install &&
 2930:          elif test $ac_prog = install &&
 3099:if test $ac_cv_lib_cposix_strerror = yes; then
 3144:if test $ac_cv_header_stdc = yes; then
 3162:if test $ac_cv_header_stdc = yes; then
 3180:if test $ac_cv_header_stdc = yes; then
 3236:if test $ac_cv_header_stdc = yes; then
 3403:if test $ac_cv_header_minix_config_h = yes; then
 3488:if test $ac_cv_func_sigblock = yes; then
 3541:if test $ac_cv_lib_bsd_sigblock = yes; then
 3716:if test $ac_cv_header_stat_broken = yes; then
 3763:if test $ac_cv_header_stdc = yes; then
 3781:if test $ac_cv_header_stdc = yes; then
 3799:if test $ac_cv_header_stdc = yes; then
 3855:if test $ac_cv_header_stdc = yes; then
 4064:if test $ac_cv_sys_tiocgwinsz_in_termios_h != yes; then
 4092:  if test $ac_cv_sys_tiocgwinsz_in_sys_ioctl_h = yes; then
 4144:if test $ac_cv_type_off_t = yes; then
 4294:if test $ac_cv_c_const = no; then
 4343:if test $ac_cv_struct_tm = sys/time.h; then
 5071:if test $ac_cv_working_alloca_h = yes; then
 5139:if test $ac_cv_func_alloca_works = yes; then
 5184:if test $ac_cv_os_cray = yes; then
 5366:if test $ac_cv_func_strcoll_works = yes; then
 5499:if test $ac_cv_func__doprnt = yes; then
 6154:if test $ac_cv_type_size_t = yes; then
 6511:if test $ac_cv_func_mmap_fixed_mapped = yes; then
 6691:  if test $jm_ac_cv_header_inttypes_h = yes; then
 6740:  if test $jm_ac_cv_header_stdint_h = yes; then
 6789:  if test $ac_cv_type_unsigned_long_long = yes; then
 6800:  if test $jm_ac_cv_header_inttypes_h = no && test 
$jm_ac_cv_header_stdint_h = no; then
 6802:    test $ac_cv_type_unsigned_long_long = yes \
 6855:  if test $gt_cv_header_inttypes_h = yes; then
 6865:  if test $gt_cv_header_inttypes_h = yes; then
 7152:          if test $use_additional = yes; then
 7911:  if test $am_cv_langinfo_codeset = yes; then
 7919:  if test $ac_cv_header_locale_h = yes; then
 7960:  if test $am_cv_val_LC_MESSAGES = yes; then
 8025:  if test $ac_verc_fail = yes; then
 8212:          if test $use_additional = yes; then
 9189:while test $# != 0
 9460:    if test $ac_beg -gt 1; then
10104:              if test $useit = yes; then