Ignore output from new Visual Studio projects.

TRAC #24020

.gitignore

@@ -1,5 +1,9 @@
 Debug
+Debug_Win32
+Debug_x64
 Release
+Release_Win32
+Release_x64
 *.sln
 *.sdf
 *.ncb
@@ -18,5 +22,3 @@ debug.txt
 third_party
 tests/third_party
 out
-build/Debug*
-build/Release*