svx: convert some horrible code to SolarMutexTryAndBuyGuard
svx: convert some horrible code to SolarMutexTryAndBuyGuard

Try to preserve the existing spin-lock insanity as-is.

Change-Id: Ic98aa33d2e56536856892fcf61de672952101ae1

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