lib/pp.rb (width_for): ignore Errno::EINVAL

The error is raised on Solaris
http://rubyci.s3.amazonaws.com/solaris10-gcc/ruby-master/log/20211130T030003Z.fail.html.gz
```
  1) Failure:
TestRubyOptions#test_require [/export/home/users/chkbuild/cb-gcc/tmp/build/20211130T030003Z/ruby/test/ruby/test_rubyoptions.rb:265]:
pid 7386 exit 1
| /export/home/users/chkbuild/cb-gcc/tmp/build/20211130T030003Z/ruby/lib/pp.rb:67:in `winsize': Invalid argument - <STDOUT> (Errno::EINVAL)
```

lib/pp.rb

@@ -65,7 +65,7 @@ class PP < PrettyPrint
     begin
       require 'io/console'
       _, width = out.winsize
-    rescue LoadError, NoMethodError, Errno::ENOTTY
+    rescue LoadError, NoMethodError, Errno::ENOTTY, Errno::EINVAL
     end
     (width || ENV['COLUMNS']&.to_i&.nonzero? || 80) - 1
   end