powerpc: also drop DCBZ usage on AmigaOS4, as it runs on hardware with other than the assumed cacheline size

git-svn-id: trunk@45802 -

rtl/powerpc/powerpc.inc

@@ -19,9 +19,11 @@
 
 {$IFNDEF LINUX}
 {$IFNDEF MORPHOS}
+{$IFNDEF AMIGAOS4}
 {$IFNDEF AIX}
     {$DEFINE USE_DCBZ}
 {$ENDIF AIX}
+{$ENDIF AMIGAOS4}
 {$ENDIF MORPHOS}
 {$ENDIF LINUX}