Enable tests and small ARM tweaks.

The most of the tests are functional now. The only exception is the one
test failing on armv7. Not sure about the PPC though.

ruby.spec

@@ -484,14 +484,17 @@ sed -i '8 a\
   s.require_paths = ["lib"]' %{buildroot}%{gem_dir}/specifications/minitest-%{minitest_version}.gemspec
 
 %check
-# TODO: Investigate the test failures.
-# OpenSSL 1.0.1 is breaking the drb test suite.
-# https://bugs.ruby-lang.org/issues/6221
-# TestTimeTZ failures - Resolved by r35377.
-# https://bugs.ruby-lang.org/issues/6318
-# TestWEBrickHTTPRequest and WEBrick::TestFileHandler fail
-# https://bugs.ruby-lang.org/issues/6319
-make check TESTS="-v -x test_drbssl.rb -x test_time_tz.rb -x test_httprequest.rb -x test_filehandler.rb"
+DISABLE_TESTS=""
+
+%ifarch armv7l armv7hl armv7hnl
+# test_call_double(DL::TestDL) fails on ARM HardFP
+# http://bugs.ruby-lang.org/issues/6592
+DISABLE_TESTS="-x test_dl2.rb $DISABLE_TESTS"
+%endif
+
+%ifnarch ppc ppc64
+make check TESTS="-v $DISABLE_TESTS"
+%endif
 
 %post libs -p /sbin/ldconfig