restoring basemutexhelper.hxx
restoring basemutexhelper.hxx

* got killed in 3cd302f4e5dd443670debfb9bbae7e3be1676ca6
* checked out from 7db45b251adf8588624fee439df3ae0629c6ac4f

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core