core: Resurrect gcc-10 support.
* include/mes/mes.h (g_datadir, g_debug, g_buf, g_continuations,
g_symbols, g_symbol_max, g_mini, R0, R1, R2, R3, M0, g_macros, g_ports,
ARENA_SIZE, MAX_ARENA_SIZE, STACK_SIZE, JAM_SIZE, GC_SAFETY, MAX_STRING,
g_arena, cell_arena, cell_zero, g_free, g_symbol, g_stack_array,
g_cells, g_news, g_stack, gc_count, gc_start_time, gc_end_time, gc_time,
__execl_c_argv, __open_boot_buf, __open_boot_file_name, __setenv_buf,
__reader_read_char_buf, g_start_time, __gettimeofday_time,
__get_internal_run_time_ts): Declare extern.
* include/mes/symbols.h ( cell_nil, cell_f, cell_t, cell_dot,
cell_arrow, cell_undefined, cell_unspecified, cell_closure,
cell_circular, cell_vm_apply, cell_vm_apply2, cell_vm_begin,
cell_vm_begin_eval, cell_vm_begin_expand, cell_vm_begin_expand_eval,
cell_vm_begin_expand_macro, cell_vm_begin_expand_primitive_load,
cell_vm_begin_primitive_load, cell_vm_begin_read_input_file,
cell_vm_call_with_current_continuation2, cell_vm_call_with_values2,
cell_vm_eval, cell_vm_eval2, cell_vm_eval_check_func,
cell_vm_eval_define, cell_vm_eval_macro_expand_eval,
cell_vm_eval_macro_expand_expand, cell_vm_eval_pmatch_car,
cell_vm_eval_pmatch_cdr, cell_vm_eval_set_x, cell_vm_evlis,
cell_vm_evlis2, cell_vm_evlis3, cell_vm_if, cell_vm_if_expr,
cell_vm_macro_expand, cell_vm_macro_expand_car,
cell_vm_macro_expand_cdr, cell_vm_macro_expand_define,
cell_vm_macro_expand_define_macro, cell_vm_macro_expand_lambda,
cell_vm_macro_expand_set_x, cell_vm_return, cell_symbol_lambda,
cell_symbol_begin, cell_symbol_if, cell_symbol_quote,
cell_symbol_define, cell_symbol_define_macro, cell_symbol_quasiquote,
cell_symbol_unquote, cell_symbol_unquote_splicing, cell_symbol_syntax,
cell_symbol_quasisyntax, cell_symbol_unsyntax,
cell_symbol_unsyntax_splicing, cell_symbol_set_x, cell_symbol_sc_expand,
cell_symbol_macro_expand, cell_symbol_portable_macro_expand,
cell_symbol_sc_expander_alist, cell_symbol_call_with_values,
cell_symbol_call_with_current_continuation, cell_symbol_boot_module,
cell_symbol_current_module, cell_symbol_primitive_load, cell_symbol_car,
cell_symbol_cdr, cell_symbol_not_a_number, cell_symbol_not_a_pair,
cell_symbol_system_error, cell_symbol_throw,
cell_symbol_unbound_variable, cell_symbol_wrong_number_of_args,
cell_symbol_wrong_type_arg, cell_symbol_buckets, cell_symbol_builtin,
cell_symbol_frame, cell_symbol_hashq_table, cell_symbol_module,
cell_symbol_procedure, cell_symbol_record_type, cell_symbol_size,
cell_symbol_stack, cell_symbol_argv, cell_symbol_mes_datadir,
cell_symbol_mes_version, cell_symbol_internal_time_units_per_second,
cell_symbol_compiler, cell_symbol_arch, cell_symbol_pmatch_car,
cell_symbol_pmatch_cdr, cell_type_bytes, cell_type_char,
cell_type_closure, cell_type_continuation, cell_type_function,
cell_type_keyword, cell_type_macro, cell_type_number, cell_type_pair,
cell_type_port, cell_type_ref, cell_type_special, cell_type_string,
cell_type_struct, cell_type_symbol, cell_type_values,
cell_type_variable, cell_type_vector, cell_type_broken_heart,
cell_symbol_program, cell_symbol_test): Likewise.
* src/globals.c: New file.
* build-aux/configure-lib.sh (mes_SOURCES): Add it.
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