This reverts commit 57879db05e8f9382125d432b61fac2248bc5e35b mingw-w64 was updated in commit ee8d569ff4696c6b4d445baef53173669182beec which now has ICalendar definition in windows.globalization.idl.
This reverts commit 57879db05e8f9382125d432b61fac2248bc5e35b mingw-w64 was updated in commit ee8d569ff4696c6b4d445baef53173669182beec which now has ICalendar definition in windows.globalization.idl.