There is, however, a faster way using Process Explorer. Start Process Explorer and select Find > Find Handle or DLL... from the menu. Enter all or part of the filename currently locked, then click Search. You should see the guilty process - devenv.exe in this case.

Double-clicking on the entry will display a list of handles for that app, with the selected handle highlighted. Right-click on the selection and choose Close Handle. You'll see a dialog warning about potential crashes or system instability (meaning don't try this with a system file.) Tell it to continue and the handle will be closed. VS will again compile without issue.