Issue #11403: add some MSVC-generated files to .hgignore

.hgignore

diff --git a/.hgignore b/.hgignore
index d1c8d72..33e6caa 100644
--- a/.hgignore
+++ b/.hgignore
@@ -60,6 +60,9 @@
 *.rej
 *~
 Lib/lib2to3/*.pickle
+PC/python_nt*.h
+PC/pythonnt_rc*.h
+PC/*.obj
 PCbuild/*.exe
 PCbuild/*.dll
 PCbuild/*.pdb