Added chipset and xta interface to Philips machines.

Major refactoring.

src/chipset/CMakeLists.txt

@@ -17,6 +17,7 @@ add_library(chipset OBJECT acc2168.c cs8230.c ali1217.c ali1429.c headland.c int
 	cs4031.c intel_420ex.c intel_4x0.c intel_sio.c intel_piix.c ../ioapic.c
 	neat.c opti495.c opti895.c opti5x7.c scamp.c scat.c via_vt82c49x.c
 	via_vt82c505.c sis_85c310.c sis_85c4xx.c sis_85c496.c sis_85c50x.c
+	gc100.c
 	opti283.c opti291.c via_apollo.c via_pipc.c wd76c10.c
 	vl82c480.c)