test/io/console/test_io_console.rb: Try the hack for Solaris

I'm not entirely sure why, but test_set_winsize_console gets stuck on
Solaris (and if I recall, macOS).  I found a hack for FreeBSD, so I want
to give it a try on Solaris too.

test/io/console/test_io_console.rb

@@ -13,7 +13,7 @@ class TestIO_Console < Test::Unit::TestCase
   # FreeBSD seems to hang on TTOU when running parallel tests
   # tested on FreeBSD 11.x
   def set_winsize_setup
-    @old_ttou = trap(:TTOU, 'IGNORE') if RUBY_PLATFORM =~ /freebsd/i
+    @old_ttou = trap(:TTOU, 'IGNORE') if RUBY_PLATFORM =~ /freebsd|solaris/i
   end
 
   def set_winsize_teardown