docs: mention meson configure and drop broken workaround script

The script is broken, and nobody noticed so it wasn't used much.

Meson has had support for printing the options by pointing to the source
dir for a while (not sure the exact version though) so I think we can
just recommend users do that.

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Yonggang Luo <luoyonggang@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21469>

bin/meson-options.py

@@ -1,63 +0,0 @@
-#!/usr/bin/env python3
-
-from os import get_terminal_size
-from textwrap import wrap
-from mesonbuild import coredata
-from mesonbuild import optinterpreter
-
-(COLUMNS, _) = get_terminal_size()
-
-def describe_option(option_name: str, option_default_value: str,
-                    option_type: str, option_message: str) -> None:
-    print('name:    ' + option_name)
-    print('default: ' + option_default_value)
-    print('type:    ' + option_type)
-    for line in wrap(option_message, width=COLUMNS - 9):
-        print('         ' + line)
-    print('---')
-
-oi = optinterpreter.OptionInterpreter('')
-oi.process('meson_options.txt')
-
-for (name, value) in oi.options.items():
-    if isinstance(value, coredata.UserStringOption):
-        describe_option(name,
-                        value.value,
-                        'string',
-                        "You can type what you want, but make sure it makes sense")
-    elif isinstance(value, coredata.UserBooleanOption):
-        describe_option(name,
-                        'true' if value.value else 'false',
-                        'boolean',
-                        "You can set it to 'true' or 'false'")
-    elif isinstance(value, coredata.UserIntegerOption):
-        describe_option(name,
-                        str(value.value),
-                        'integer',
-                        "You can set it to any integer value between '{}' and '{}'".format(value.min_value, value.max_value))
-    elif isinstance(value, coredata.UserUmaskOption):
-        describe_option(name,
-                        str(value.value),
-                        'umask',
-                        "You can set it to 'preserve' or a value between '0000' and '0777'")
-    elif isinstance(value, coredata.UserComboOption):
-        choices = '[' + ', '.join(["'" + v + "'" for v in value.choices]) + ']'
-        describe_option(name,
-                        value.value,
-                        'combo',
-                        "You can set it to any one of those values: " + choices)
-    elif isinstance(value, coredata.UserArrayOption):
-        choices = '[' + ', '.join(["'" + v + "'" for v in value.choices]) + ']'
-        value = '[' + ', '.join(["'" + v + "'" for v in value.value]) + ']'
-        describe_option(name,
-                        value,
-                        'array',
-                        "You can set it to one or more of those values: " + choices)
-    elif isinstance(value, coredata.UserFeatureOption):
-        describe_option(name,
-                        value.value,
-                        'feature',
-                        "You can set it to 'auto', 'enabled', or 'disabled'")
-    else:
-        print(name + ' is an option of a type unknown to this script')
-        print('---')