Stage 24a: Use full call context in error reporting.

Stage 24a: Use full call context in error reporting.

* m4/m4module.h (m4_error, m4_warn): Change parameter type.
(m4_error_at_line, m4_warn_at_line): Delete.
(m4_debug_set_output, m4_skip_line, m4_bad_argc, m4_numeric_arg)
(m4_parse_truth_arg, m4_symbol_value_lookup): Adjust all clients.
* m4/m4private.h (m4__next_token): Likewise.
* m4/utility.c (m4_verror_at_line): Alter parameter, and use
caller's location if caller is provided.
(m4_error, m4_warn): Change parameter type.
(m4_error_at_line, m4_warn_at_line): Delete.
(m4_bad_argc, m4_numeric_arg, m4_parse_truth_arg)
(m4_symbol_value_lookup): Adjust all callers.
* m4/debug.c (set_debug_file, m4_debug_set_output): Likewise.
* m4/input.c (m4_skip_line, m4__next_token): Likewise.
* m4/macro.c (expand_argument, collect_arguments, m4_macro_call)
(process_macro): Likewise.
* modules/m4.h (m4_make_temp_func): Likewise.
* modules/evalparse.c (m4_evaluate): Likewise.
* modules/format.c (arg_int, arg_long, arg_double, format):
Likewise.
* modules/gnu.c (builtin, changeresyntax, changesyntax, debugfile)
(debuglen, debugmode, esyscmd, indir, mkdtemp, patsubst, regexp)
(renamesyms, syncoutput, regexp_compile, substitute)
(regexp_substitute, m4_resyntax_encode_safe): Likewise.
* modules/m4.c (define, undefine, pushdef, popdef, ifdef, ifelse)
(m4_dump_symbols, defn, syscmd, incr, decr, divert, undivert, dnl)
(include, maketemp, mkstemp, m4exit, traceon, traceoff, substr):
Likewise.
* modules/stdlib.c (setenv, getpwuid, srand): Likewise.
* modules/time.c (ctime, gmtime, localtime, mktime, strftime):
Likewise.
* tests/options.at (--syncoutput): Add test for invalid
command-line argument.  Split xfailed portion...
(--syncoutput and diversions): ...into new test.
(unknown option): New test.
* tests/freeze.at (reloading unknown builtin): Update expected
output.

Signed-off-by: Eric Blake <ebb9@byu.net>