Another try to update getopt files. This time we add a dummy

Another try to update getopt files.  This time we add a dummy
gettext.h file to satisfy the dependency.

* src/include/getopt.h, src/libs/libgroff/getopt.c,
src/libs/libgroff/getopt1.c: Updated from GNU libc CVS.

* src/include/getopt_int.h: New file (from GNU libc CVS).

* src/include/gettext.h: Dummy file which just defines a gettext()
macro.

* src/include/groff-getopt.h: Updated.

* src/include/Makefile.sub (HDRS): Add getopt_int.h and gettext.h.

* src/libs/libdriver/input.cpp (IntArray): Remove superfluous
`const' keywords in return value.

* src/preproc/html/pushback.cpp (pushBackBuffer::~pushBackBuffer):
Remove redundant variable `old'.
(pushBackBuffer::skipToNewline): Remove redundant variable `ch'.

* src/preproc/tbl/main.cpp (process_table): Remove redundant
variable `c'.

Fix more friend name injection problems since modern C++ compilers
fail otherwise.  We simply provide (global) declarations for all
functions declared as friends.  This is not really necessary but
doesn't harm.

* src/preproc/eqn/lex.cpp: Provide declarations for get_char,
peek_char, and get_location.

* src/preproc/refer/ref.h: Provide declarations for
compare_reference, same_reference, same_year, same_date,
same_author_last_name, and same_author_name.

* src/roff/troff/div.h: Provide declarations for do_divert and
page_offset.

* src/roff/troff/env.h: Provide declarations for title_length,
space_size, fill, no_fill, adjust, no_adjust, center, right_justify,
vertical_spacing, post_vertical_spacing, line_spacing, line_length,
indent, temporary_indent, do_underline, do_input_trap, set_tabs,
margin_character, no_number, number_lines, leader_character,
tab_character, hyphenate_request, no_hyphenate,
hyphen_line_max_request, hyphenation_space_request,
hyphenation_margin_request, line_width, tabs_save, tabs_restore,
line_tabs_request, widow_control_request, and do_divert.

* src/roff/troff/input.cpp: Provide declaration for chop_macro.

* src/roff/troff/node.cpp: Provide declarations for class
tfont_spec.
Provide declaration for make_tfont.