Windows: Do not close process handle in Process#close

spec/std/process_spec.cr

@@ -333,9 +333,7 @@ describe Process do
       {% end %}
     end
 
-    # TODO: this spec gives "WaitForSingleObject: The handle is invalid."
-    # is this because standard streams on windows aren't async?
-    pending_win32 "can link processes together" do
+    it "can link processes together" do
       buffer = IO::Memory.new
       Process.run(*stdin_to_stdout_command) do |cat|
         Process.run(*stdin_to_stdout_command, input: cat.output, output: buffer) do

src/crystal/system/win32/process.cr

@@ -95,6 +95,8 @@ struct Crystal::System::Process
       raise "BUG: Process still active"
     end
     exit_code
+  ensure
+    release
   end
 
   def exists?

src/process.cr

@@ -346,7 +346,6 @@ class Process
     close_io @input
     close_io @output
     close_io @error
-    @process_info.release
   end
 
   # Asks this process to terminate.