Get `ruby_nonempty_memcpy` to have C linkage

	Fixes [Bug #17788]
	---
	 include/ruby/internal/memory.h | 2 ++
	 1 file changed, 2 insertions(+)

	Fix stack buffer overflow

	https://hackerone.com/reports/1306859
	---
	 include/ruby/internal/memory.h | 6 +++---
	 random.c                       | 7 ++-----
	 2 files changed, 5 insertions(+), 8 deletions(-)

	intern/select/posix.h: remove unused parameter from rb_fd_dup

	This unused parameter seems to be accidently introduced by https://github.com/ruby/ruby/commit/9e6e39c
	---
	 include/ruby/internal/intern/select/posix.h | 3 +--
	 1 file changed, 1 insertion(+), 2 deletions(-)

The count of rb_alloc_tmp_buffer_with_count is the allocation size
counted in VALUE size but not in the requested element size.

Co-authored-by: Yusuke Endoh <mame@ruby-lang.org>
Co-authored-by: Koichi Sasada <ko1@atdot.net>

Deleted well over a decade ago in commit 977d66ec993b0f1892fb3e4cd8ac.

* Use the wrapper of rb_cObject instead of data access
* Replaced rest of extentions
* Updated the version guard for Data
* Added the version guard of rb_cData

Has been deprecated since 684bdf6171b76f5bc5e4f05926a5ab01ec2b4fd5.

Matz says in [ruby-core:83954] that Data should be an alias of Object.
Because rb_cData has not been deprecated, let us deprecate the constant
to make it a C-level synonym of rb_cObject.

It was my bad, the exception that actually raises is rb_eNoMemError.
[ci skip]

`@exception` is an alias of `@throw`.  It might suite Ruby's document
because ruby uses `raise` terminology instead of `throw`. [ci skip]