Port r66648 to fix test failure on SOURCE_DATE_EPOCH

ruby/ruby@6b86134

Author: sorah

debian/patches/0008-Unset-SOURCE_DATE_EPOCH-on-Rubygems-test-cases.patch

@@ -0,0 +1,25 @@
+From: sorah <sorah@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+Date: Sun, 30 Dec 2018 03:15:58 +0000
+Subject: Unset SOURCE_DATE_EPOCH on Rubygems test cases
+
+Relates to r66554. When test suites run with SOURCE_DATE_EPOCH, several
+tests would fail.  Environment Variables are already kept with this
+setup & teardown phase.
+
+git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
+---
+ lib/rubygems/test_case.rb | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
+index 7648ffd..a93f749 100644
+--- a/lib/rubygems/test_case.rb
++++ b/lib/rubygems/test_case.rb
+@@ -254,6 +254,7 @@ def setup
+     @orig_gem_env_requirements = ENV.to_hash
+ 
+     ENV['GEM_VENDOR'] = nil
++    ENV['SOURCE_DATE_EPOCH'] = nil
+ 
+     @current_dir = Dir.pwd
+     @fetcher     = nil

debian/patches/series

@@ -5,3 +5,4 @@
 0005-exclude-several-tests-unstable-in-Docker.patch
 0006-Port-to-kfreebsd-amd64.patch
 0007-Fix-tests-when-ruby-program-suffix-is-used-without-r.patch
+0008-Unset-SOURCE_DATE_EPOCH-on-Rubygems-test-cases.patch