Add CMake build files

src/chipset/CMakeLists.txt

@@ -0,0 +1,18 @@
+add_library(chipset OBJECT acc2168.c cs8230.c ali1429.c headland.c intel_82335.c
+	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
+	opti283.c opti291.c umc491.c via_apollo.c via_pipc.c wd76c10.c
+	vl82c480.c)
+
+if(STPC)
+	target_sources(chipset PRIVATE stpc.c)
+endif()
+
+if(M1489)
+	target_sources(chipset PRIVATE ali1489.c)
+endif()
+
+if(M6117)
+	target_sources(chipset PRIVATE ali6117.c)
+endif()