Fix FTBFS due to glibc 2.31.9000 implementing lchmod(2).

ruby.spec

@@ -156,6 +156,11 @@ Patch19: ruby-2.7.1-Timeout-the-test_bug_reporter_add-witout-raising-err.patch
 # Add support for .include directive used by OpenSSL config files.
 # https://github.com/ruby/openssl/pull/216
 Patch22: ruby-2.6.0-config-support-include-directive.patch
+# Fix lchmod test failures.
+# https://github.com/ruby/ruby/commit/a19228f878d955eaf2cce086bcf53f46fdf894b9
+Patch41: ruby-2.8.0-Brace-the-fact-that-lchmod-can-EOPNOTSUPP.patch
+# https://github.com/ruby/ruby/commit/72c02aa4b79731c7f25c9267f74b347f1946c704
+Patch42: ruby-2.8.0-Moved-not-implemented-method-tests.patch
 
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 Suggests: rubypick
@@ -550,6 +555,8 @@ rm -rf ext/fiddle/libffi*
 %patch14 -p1
 %patch19 -p1
 %patch22 -p1
+%patch41 -p1
+%patch42 -p1
 
 # Provide an example of usage of the tapset:
 cp -a %{SOURCE3} .
@@ -849,6 +856,11 @@ sed -i '/^  def test_queue_with_trap$/,/^  end$/ s/^/#/g' \
 # https://bugs.ruby-lang.org/issues/16410
 MSPECOPTS="$MSPECOPTS -P 'File.utime allows Time instances in the far future to set mtime and atime'"
 
+# Disable File.lchmod specs, which fails when building against glibc 2.31.9000.
+# https://bugs.ruby-lang.org/issues/16749
+MSPECOPTS="$MSPECOPTS -P 'File.lchmod returns false from \#respond_to?'"
+MSPECOPTS="$MSPECOPTS -P 'File.lchmod raises a NotImplementedError when called'"
+
 make check TESTS="-v $DISABLE_TESTS" MSPECOPT="-fs $MSPECOPTS"
 
 %files
@@ -1198,6 +1210,7 @@ make check TESTS="-v $DISABLE_TESTS" MSPECOPT="-fs $MSPECOPTS"
 - Fix FTBFS due to libyaml 0.2.5.
 - Disable LTO, which appear to cause issues with SIGSEV handler.
 - Avoid possible timeout errors in TestBugReporter#test_bug_reporter_add.
+- Fix FTBFS due to glibc 2.31.9000 implementing lchmod(2).
 
 * Thu May 07 2020 Pavel Valena <pvalena@redhat.com> - 2.6.6-125
 - Upgrade to Ruby 2.6.6.