test/mkmf/test_flags.rb: try to suppress random CI failure

on AIX ppc
https://rubyci.org/logs/rubyci.s3.amazonaws.com/aix71_ppc/ruby-trunk/log/20181226T113305Z.fail.html.gz

test/lib/test/unit/assertions.rb: ditto, for TestIO#test_copy_stream_no_busy_wait

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66591 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/test/mkmf/test_flags.rb b/test/mkmf/test_flags.rb
index 69a1084608..a3596d8e55 100644
--- a/test/mkmf/test_flags.rb
+++ b/test/mkmf/test_flags.rb
@@ -41,7 +41,7 @@ class TestMkmf
     end
 
     def test_try_cflag_invalid_opt
-      assert_separately([], <<-'end;') #do
+      assert_separately([], <<-'end;', timeout: 30) #do
         assert(!try_cflags("nosuch.c"), TestMkmf::MKMFLOG)
         assert(have_devel?, TestMkmf::MKMFLOG)
       end;