Fix for Apollo PIC8259 breakage [Hans Ostermeyer]

git-svn-id: svn://dspnet.fr/mame/trunk@23284 749742ba-7341-0410-aadc-df50b521781e
cast error found by mingw 4.7.4 (nw)

git-svn-id: svn://dspnet.fr/mame/trunk@23285 749742ba-7341-0410-aadc-df50b521781e