Since around 2018, we have been using spaces for indentation for newly
added code[1]. The mixed use of tabs and spaces has repeatedly confused
new contributors who configured their editors to use a different tab
size than 8. Since git blame can now skip specific commits, ruby/ruby
did a mass reformatting of tabs in 2022[2]. Do the same in ruby/openssl.

While at it, fix a few indentation issues, mainly in switch-case labels
and in ossl_ssl_session.c, which used doubled indentation size.

This patch contains white-space changes only. git diff -w output should
be empty.

[1] https://bugs.ruby-lang.org/issues/14246
[2] https://bugs.ruby-lang.org/issues/18891

https://github.com/ruby/openssl/commit/4d6214f507

These declarations were added to every source file because older
versions of RDoc did not resolve ancestor tree across files. Since
RDoc 6.9.0 supports this, this workaround is no longer needed.

    https://redirect.github.com/ruby/rdoc/pull/1217

https://github.com/ruby/openssl/commit/6491ce63be

ruby/openssl exposes OIDs to Ruby as strings in many places, but the
conversion logic has been duplicated and the behavior is inconsistent.
There are mainly two patterns:

 - Returns the short name associated with the OID/NID, or the dotted
   decimal notation if it is unknown to OpenSSL.
 - Returns the long name, or the dotted decimal notation.

These patterns are implemented using different OpenSSL APIs and that
caused subtle differences. Add helper functions ossl_asn1obj_to_string()
and ossl_asn1obj_to_string_long_name() to unify the logic.

Also, document the current behaviors where it is not yet done. The
inconsistency was likely unintentional, but since it dates back to the
original implementations, standardizing it now would cause more issues
than it resolves.

https://github.com/ruby/openssl/commit/2ea36c21a4

This reverts commit ec01cd9bbbaf3e6f324e0a6769b8383857d2bc07.

This should no longer break the tests, now that the following changes
have been applied:

 - RubyGems change: 32977f3869ba1c44950f484ddbf3a12889c0b20b
 - ruby/openssl change: e8261963c79ba61453f7f0dae281c33a1287b351

This reverts commit 4e8bbb07dd4936b97a6b39d54a6977a107518e1f.

It broke RubyGems tests:
https://rubyci.s3.amazonaws.com/debian/ruby-master/log/20250727T123003Z.fail.html.gz

OpenSSL::X509::StoreContext#current_cert incorrectly calls
ossl_x509_new() with NULL to create a bogus Certificate object, and a
test case in RubyGems relies on it. This will be reapplied when both
are fixed.

These functions are not actually called with NULL. It also doesn't make
sense to do so, so let's simplify the definitions.

https://github.com/ruby/openssl/commit/ef277083ba

https://github.com/ruby/openssl/commit/17f87d2cf0

https://github.com/ruby/openssl/commit/85d6b7f192

OpenSSL::ASN1 is being rewritten in Ruby. To make it easier, let's
remove dependency to the instance variables and the internal-use
function ossl_asn1_get_asn1type() outside OpenSSL::ASN1.

This also fixes the insufficient validation of the passed value with
its tagging.

https://github.com/ruby/openssl/commit/35a157462e

Update the references to the file "LICENCE" with "COPYING".

The file LICENCE doesn't exist in ruby/ruby nor ruby/openssl. This has
been always the case since OpenSSL for Ruby 2 was merged to the ruby
tree as a standard library in 2003.

In OpenSSL for Ruby 2's CVS repository[1], the LICENCE file contained
an old version of the Ruby License, identical to the COPYING file that
was in Ruby's tree at that time (r4128[2]).

[1] http://cvs.savannah.gnu.org/viewvc/rubypki/ossl2/LICENCE?revision=1.1.1.1&view=markup
[2] https://github.com/ruby/ruby/blob/231247c010acba191b78ed2d1310c935e63ad919/COPYING

https://github.com/ruby/openssl/commit/5bccf07d04