Some RTG driver stuff

* Do not explicitly set INDISPLAYCHAIN flag, let P96 handle this through the tooltypes.
* Remove 030 card file, was identical to 020 version.
* Remove 020i card file, currently not working.
* Update build script, remove build of 030 card file and disable building 020i card file.

platforms/amiga/rtg/rtg_driver_amiga/build.sh

@@ -1,3 +1,2 @@
 m68k-amigaos-gcc pigfx-2.c -m68020 -O2 -o pigfx020.card -noixemul -Wall -Wextra -Wno-unused-parameter -fomit-frame-pointer -nostartfiles -lamiga
-m68k-amigaos-gcc pigfx-2.c -m68030 -O2 -o pigfx030.card -noixemul -Wall -Wextra -Wno-unused-parameter -fomit-frame-pointer -nostartfiles -lamiga
-m68k-amigaos-gcc pigfx-2.c -m68020 -O2 -o pigfx020i.card -noixemul -Wall -Wextra -Wno-unused-parameter -fomit-frame-pointer -nostartfiles -lamiga -DIRTG
+#m68k-amigaos-gcc pigfx-2.c -m68020 -O2 -o pigfx020i.card -noixemul -Wall -Wextra -Wno-unused-parameter -fomit-frame-pointer -nostartfiles -lamiga -DIRTG

platforms/amiga/rtg/rtg_driver_amiga/pigfx-2.c

@@ -259,7 +259,7 @@ int __attribute__((used)) InitCard(__REGA0(struct BoardInfo* b)) {
     b->PaletteChipType = PCT_S3ViRGE;
     b->GraphicsControllerType = GCT_S3ViRGE;
 
-    b->Flags = BIF_INDISPLAYCHAIN | BIF_GRANTDIRECTACCESS | BIF_HARDWARESPRITE | BIF_FLICKERFIXER;
+    b->Flags |= BIF_GRANTDIRECTACCESS | BIF_HARDWARESPRITE | BIF_FLICKERFIXER;
     b->RGBFormats = 1 | 2 | 512 | 1024 | 2048;
     b->SoftSpriteFlags = 0;
     b->BitsPerCannon = 8;