Revert "Skip BUGs on Solaris"

This reverts commit 8adefd4cf29288f6e43f20efbdd44b215ae16c7a.

I couldn't see any failure on Solaris if the guard is removed.
Give it a try.

test/drb/drbtest.rb

@@ -115,7 +115,7 @@ module DRbBase
         end
       }
     end
-    @drb_service&.finish
+    @drb_service.finish
   end
 end
 

test/drb/test_drbssl.rb

@@ -41,7 +41,6 @@ end
 class TestDRbSSLCore < Test::Unit::TestCase
   include DRbCore
   def setup
-    skip 'FIXME: BUG in OpenSSL on Solaris' if RUBY_PLATFORM =~ /solaris/i
     @drb_service = DRbSSLService.new
     super
     setup_service 'ut_drb_drbssl.rb'
@@ -60,7 +59,6 @@ end
 class TestDRbSSLAry < Test::Unit::TestCase
   include DRbAry
   def setup
-    skip 'FIXME: BUG in OpenSSL on Solaris' if RUBY_PLATFORM =~ /solaris/i
     @drb_service = DRbSSLService.new
     super
     setup_service 'ut_array_drbssl.rb'