Define `incflags` also on mswin

…a9b87126d59e4766479a7aa12cf7a648f46506: [Backport #20447]

	Fix pointer incompatiblity

	Since the subsecond part is discarded, WIDEVAL to VALUE conversion is
	needed.

	Some functions are not used when `THREAD_MODEL=none`

	`rb_thread_sched_destroy` is not used now at all

…Backport #20515]

	ci: Test whether GMP is working in compilers.yml (#10875)

	Avoid reoccurence of [Bug #20515]

	Requires #10876 since 18eaf0b

	bug: https://bugs.ruby-lang.org/issues/20515

	RUBY_CHECK_HEADER didn't define HAVE_{header-file} (#10876)

	--with-gmp is not working at all because HAVE_GMP_H
	was missing since 18eaf0b. [Bug #20515]

	bug: https://bugs.ruby-lang.org/issues/20515
	follow-up: https://bugs.ruby-lang.org/issues/20494
	follow-up: 18eaf0b
	follow-up: #10805

	test_bignum: defined? returns String (#10880)
	MIME-Version: 1.0
	Content-Type: text/plain; charset=UTF-8
	Content-Transfer-Encoding: 8bit

	didn't verify the test is working properly due to mistaken auto-merge… [Bug #20515]

	bug: https://bugs.ruby-lang.org/issues/20515
	follow-up: 22e4eed
	follow-up: #10875

	Do not pollute toplevel namespace

	Update bundled_gems

so that they are linked correctly on GitHub

	Clear runtime dependencies if default gems is specified.

	The current build system uses runtime dependencies from only
	`.bundle` directory. We shouldn't install runtime dependencies
	from rubygems.org when `make test-bundled-gems` is invoked.

	Fixed dependencies list format

	Don't need to remove ruby2_keywords dependency from drb

	Re-use strscan with ruby repo

	Revert "Rollback to released version numbers of stringio and strscan"

	This reverts commit 6a79e53.

	[ruby/strscan] StringScanner#captures: Return nil not "" for unmached capture (ruby/strscan#72)

	fix ruby/strscan#70
	If there is no substring matching the group (s[3]), the behavior is
	different.

	If there is no substring matching the group, the corresponding element
	(s[3]) should be nil.

	```
	s = StringScanner.new('foobarbaz') #=> #<StringScanner 0/9 @ "fooba...">
	s.scan /(foo)(bar)(BAZ)?/  #=> "foobar"
	s[0]           #=> "foobar"
	s[1]           #=> "foo"
	s[2]           #=> "bar"
	s[3]           #=> nil
	s.captures #=> ["foo", "bar", ""]
	s.captures.compact #=> ["foo", "bar", ""]
	```

	```
	s = StringScanner.new('foobarbaz') #=> #<StringScanner 0/9 @ "fooba...">
	s.scan /(foo)(bar)(BAZ)?/  #=> "foobar"
	s[0]           #=> "foobar"
	s[1]           #=> "foo"
	s[2]           #=> "bar"
	s[3]           #=> nil
	s.captures #=> ["foo", "bar", nil]
	s.captures.compact #=> ["foo", "bar"]
	```

	https://docs.ruby-lang.org/ja/latest/method/MatchData/i/captures.html
	```
	/(foo)(bar)(BAZ)?/ =~ "foobarbaz" #=> 0
	$~.to_a        #=> ["foobar", "foo", "bar", nil]
	$~.captures #=> ["foo", "bar", nil]
	$~.captures.compact #=> ["foo", "bar"]
	```

	* StringScanner#captures is not yet documented.
	https://docs.ruby-lang.org/ja/latest/class/StringScanner.html

	ruby/strscan@1fbfdd3c6f

	[ruby/strscan] Bump version

	ruby/strscan@d6f97ec102

This is a backport of 6c8ae44 with a
test tailored to crash the 3.3.x branch (from GH-10904).

    Previously, we read the last element array even when the array was
    empty, doing an out-of-bounds access. This sometimes caused a SEGV.

    [Bug #20496]

…piling (#10911)

Do not emit shape transition warnings when YJIT is compiling

[Bug #20522]

If `Warning.warn` is redefined in Ruby, emitting a warning would invoke
Ruby code, which can't safely be done when YJIT is compiling.

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

	[Bug #20517] Make a multibyte character one token at meta escape