dev-ruby/rspec-core: remove unused patch(es)

Signed-off-by: Michael Mair-Keimberger <m.mairkeimberger@gmail.com>
Signed-off-by: Aaron Bauman <bman@gentoo.org>

dev-ruby/rspec-core/files/rspec-core-3.8.0-ruby26.patch

@@ -1,23 +0,0 @@
-From 5e6171ee7dadd520991153009eb01d7be3c82e7e Mon Sep 17 00:00:00 2001
-From: "Keiji, Yoshimi" <walf443@gmail.com>
-Date: Mon, 10 Dec 2018 22:40:16 +0900
-Subject: [PATCH] Fixed warnings: lib/rspec/core/metadata.rb:172: warning:
- Object#=~ is deprecated; it always returns nil (#2582)
-
----
- lib/rspec/core/metadata.rb | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/lib/rspec/core/metadata.rb b/lib/rspec/core/metadata.rb
-index 094a7a3b3..c68627ac5 100644
---- a/lib/rspec/core/metadata.rb
-+++ b/lib/rspec/core/metadata.rb
-@@ -169,7 +169,7 @@ def file_path_and_line_number_from(backtrace)
-         end
- 
-         def description_separator(parent_part, child_part)
--          if parent_part.is_a?(Module) && child_part =~ /^(#|::|\.)/
-+          if parent_part.is_a?(Module) && /^(?:#|::|\.)/.match(child_part.to_s)
-             ''.freeze
-           else
-             ' '.freeze