Styles.c: add `SetupMutex` directive in Inno Setup keywords.
Styles.c: add `SetupMutex` directive in Inno Setup keywords.

capturePointer/notepad2-mod,XhmikosR/notepad2-mod,roukaour/notepad2-mod,roukaour/notepad2-mod,Uni-/notepad2-mod,XhmikosR/notepad2-mod,Uni-/notepad2-mod,XhmikosR/notepad2-mod,roukaour/notepad2-mod,roukaour/notepad2-mod,XhmikosR/notepad2-mod,capturePointer/notepad2-mod,capturePointer/notepad2-mod,roukaour/notepad2-mod,capturePointer/notepad2-mod,XhmikosR/notepad2-mod,Uni-/notepad2-mod,capturePointer/notepad2-mod,Uni-/notepad2-mod,roukaour/notepad2-mod,capturePointer/notepad2-mod,Uni-/notepad2-mod,XhmikosR/notepad2-mod,Uni-/notepad2-mod