[Visual Studio] Error C2471 cannot update program database xxx.pdb

• Problem: 
• 在 MSVC下 build code時, 若出現 error C2471: cannot update program database 'xxx.pdb' 
• Reason:
• Program database 的 process 未正常關閉.
• Solution:
• Ctrl+Alt+Del 叫出 Task Manager
• 強制關閉 mspdbsrv.exe (Microsoft Program Database)
• Ref: mspdsrv living forever