ls: demacroize

Prefer functions or constants to macros where either will do.
That’s cleaner, and nowadays there’s no performance reason to
prefer macros.  All uses changed.
* src/ls.c (INITIAL_TABLE_SIZE, MIN_COLUMN_WIDTH):
Now constants instead of macros.
(file_or_link_mode): New function, replacing the old macro
FILE_OR_LINK_MODE.
(dired_outbyte): New function, replacing the old macro DIRED_PUTCHAR.
(dired_outbuf): New function, replacing the old macro DIRED_FPUTS.
(dired_outstring): New function, replacing the old macro
DIRED_FPUTS_LITERAL.
(dired_indent): New function, replacing the old macro DIRED_INDENT.
(push_current_dired_pos): New function, replacing the old macro
PUSH_CURRENT_DIRED_POS.
(assert_matching_dev_ino): New function, replacing the old macro
ASSERT_MATCHING_DEV_INO.
(do_stat, do_lstat, stat_for_mode, stat_for_ino, fstat_for_ino)
(signal_init, signal_restore, cmp_ctime, cmp_mtime, cmp_atime)
(cmp_btime, cmp_size, cmp_name, cmp_extension)
(fileinfo_name_width, cmp_width, cmp_version):
No longer inline; compilers can deduce this well enough nowadays.
(main): Protect unused assert with ‘if (false)’ rather than
commenting it out, so that the compiler checks the code.
(print_dir): Output the space and newline in the same buffer
as the human-readable number they surround.
(dirfirst_check): New function, replacing the old macro
DIRFIRST_CHECK.  Simplify by using subtraction.
(off_cmp): New function, replacing the old macro longdiff.
(print_long_format): No need to null-terminate the string now.
(format_user_or_group): Let printf count the bytes.

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