gnu: ruby-x25519: Fix build on non x86_64.

* gnu/packages/patches/ruby-x25519-automatic-fallback-non-x86_64.patch:
New patch.
* gnu/packages/ruby.scm (ruby-x25519)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Register it.

Change-Id: If9c3b8dd8d818094f4cc5392bd5717f1430c369a
Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/local.mk

@@ -1999,6 +1999,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/ruby-latex-decode-fix-test.patch		\
   %D%/packages/patches/ruby-mustache-1.1.1-fix-race-condition-tests.patch \
   %D%/packages/patches/ruby-nokogiri.patch			\
+  %D%/packages/patches/ruby-x25519-automatic-fallback-non-x86_64.patch \
   %D%/packages/patches/rustc-1.54.0-src.patch			\
   %D%/packages/patches/rust-1.64-fix-riscv64-bootstrap.patch	\
   %D%/packages/patches/rust-1.70-fix-rustix-build.patch	\

gnu/packages/patches/ruby-x25519-automatic-fallback-non-x86_64.patch

@@ -0,0 +1,45 @@
+from https://patch-diff.githubusercontent.com/raw/RubyCrypto/x25519/pull/36.patch
+
+From 5886507e08488c0ed116b1979a073b78b9495683 Mon Sep 17 00:00:00 2001
+From: Eric Long <i@hack3r.moe>
+Date: Sat, 15 Apr 2023 02:58:26 +0800
+Subject: [PATCH] Add automatic fallback for non-x86_64 targets
+
+---
+ Rakefile                          | 2 +-
+ ext/x25519_precomputed/extconf.rb | 6 +++---
+ 2 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/Rakefile b/Rakefile
+index 535697c..6e4f4d3 100644
+--- a/Rakefile
++++ b/Rakefile
+@@ -7,7 +7,7 @@ CLEAN.include("**/*.o", "**/*.so", "**/*.bundle", "pkg", "tmp")
+ 
+ require "rake/extensiontask"
+ %w[precomputed ref10].each do |provider|
+-  next if provider == "precomputed" && RUBY_PLATFORM =~ /arm64-darwin/
++  next if provider == "precomputed" && RUBY_PLATFORM !~ /x86_64|x64/
+ 
+   Rake::ExtensionTask.new("x25519_#{provider}") do |ext|
+     ext.ext_dir = "ext/x25519_#{provider}"
+diff --git a/ext/x25519_precomputed/extconf.rb b/ext/x25519_precomputed/extconf.rb
+index 7f2ba4d..b049f98 100644
+--- a/ext/x25519_precomputed/extconf.rb
++++ b/ext/x25519_precomputed/extconf.rb
+@@ -4,12 +4,12 @@
+ 
+ require "mkmf"
+ 
+-if RUBY_PLATFORM =~ /arm64-darwin|aarch64-linux/
+-  File.write("Makefile", "install clean: ;")
+-else
++if RUBY_PLATFORM =~ /x86_64|x64/
+   $CFLAGS << " -Wall -O3 -pedantic -std=c99 -mbmi -mbmi2 -march=haswell"
+ 
+   create_makefile "x25519_precomputed"
++else
++  File.write("Makefile", "install clean: ;")
+ end
+ 
+ # rubocop:enable Style/GlobalVars

gnu/packages/ruby.scm

@@ -34,7 +34,7 @@
 ;;; Copyright © 2023 Yovan Naumovski <yovan@gorski.stream>
 ;;; Copyright © 2023 gemmaro <gemmaro.dev@gmail.com>
 ;;; Copyright © 2023 Janneke Nieuwenhuizen <janneke@gnu.org>
-;;; Copyright © 2023 Zheng Junjie <873216071@qq.com>
+;;; Copyright © 2023, 2024 Zheng Junjie <873216071@qq.com>
 ;;; Copyright © 2023, 2024 Hartmut Goebel <h.goebel@crazy-compilers.com>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -3258,7 +3258,10 @@ error streams.")
               (file-name (git-file-name name version))
               (sha256
                (base32
-                "1g0311ly32f6hfn4q5fvkbjbl2bhv1l9fx6s0kglxfsrwq51926y"))))
+                "1g0311ly32f6hfn4q5fvkbjbl2bhv1l9fx6s0kglxfsrwq51926y"))
+              (patches
+               (search-patches
+                "ruby-x25519-automatic-fallback-non-x86_64.patch"))))
     (build-system ruby-build-system)
     (arguments
      (list #:test-target "spec"