Add missing void prototypes to rts functions

rts/CheckUnload.c

rts/ExecPage.c

rts/ForeignExports.c

rts/IPE.c

rts/Libdw.c

rts/Linker.c

rts/OldARMAtomic.c

rts/Printer.c

rts/ReportMemoryMap.c

rts/RtsAPI.c

rts/RtsMessages.c

rts/Schedule.c

rts/StaticPtrTable.c

rts/Stats.c

rts/Ticky.c

rts/Trace.c

rts/adjustor/LibffiAdjustor.c

rts/adjustor/NativeAmd64.c

rts/adjustor/NativeAmd64Mingw.c

rts/adjustor/NativeIA64.c