Preliminary VIA Cyrix III emulation

This adds preliminary emulation of the first-gen Samuel core, used in the VIA Cyrix III CPU, at clock speeds from 66 to 700 MHz. This also moves the 440BX emulation out of the dev-branch.

Things working:
- CPUID
- Windows 98SE
- Timings seem identical between WinChip/W2's integer section and this

Things left to do:
- 3DNow on old dynarec
- Half-speed FPU (currently simulated with WinChip 1 timings instead of WinChip 2)

src/chipset/chipset.h

@@ -43,8 +43,8 @@ extern const device_t	i430vx_device;
 extern const device_t	i430tx_device;
 #if defined(DEV_BRANCH) && defined(USE_I686)
 extern const device_t	i440fx_device;
-extern const device_t	i440bx_device;
 #endif
+extern const device_t	i440bx_device;
 
 /* NEAT */
 extern const device_t	neat_device;