Prefer ptrdiff_t to size_t when either will do

Signed types are a bit safer, as they avoid some comparison confusion
and -fsanitize=undefined can check more misuses of them.
* src/alloc.c (lisp_malloc, lisp_align_malloc)
(allocate_string_data, allocate_vector_from_block, object_bytes):
* src/coding.c (from_unicode_buffer):
* src/decompress.c (acc_size, accumulate_and_process_md5):
* src/emacs.c (load_seccomp, shut_down_emacs):
* src/fns.c (sxhash_bignum):
* src/ftfont.c (get_adstyle_property):
* src/image.c (lookup_image, xpm_init_color_cache)
(xpm_cache_color):
* src/json.c (json_out_str, struct json_parser)
(json_make_object_workspace_for_slow_path)
(json_make_object_workspace_for, json_parse_array)
(json_parse_object):
* src/sysdep.c (get_current_dir_name_or_unreachable)
(init_sys_modes, convert_speed):
* src/termchar.h (struct tty_display_info):
* src/textconv.h (struct textconv_conversion_text):
* src/xfns.c (struct x_xim_text_conversion_data)
(x_encode_xim_text):
* src/xselect.c (struct transfer, c_size_for_format)
(x_size_for_format, selection_data_for_offset)
(selection_data_size, x_start_selection_transfer)
(x_continue_selection_transfer):
Prefer ptrdiff_t to size_t when either will do.
* src/term.c (Ftty__set_output_buffer_size):
Limit output buffer size to PTRDIFF_MAX as well as to SIZE_MAX.

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