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/cpu_common/cpu.h

@@ -76,6 +76,7 @@ enum {
     CPU_K6_2P,
     CPU_K6_3P,
 #endif
+    CPU_CYRIX3S,
 #if defined(DEV_BRANCH) && defined(USE_I686)
     CPU_PENTIUMPRO,	/* 686 class CPUs */
     CPU_PENTIUM2,
@@ -152,6 +153,7 @@ extern CPU	cpus_6x86[];
 #ifdef USE_NEW_DYNAREC
 extern CPU	cpus_6x86SS7[];
 #endif
+extern CPU  cpus_Cyrix3[];
 #if defined(DEV_BRANCH) && defined(USE_I686)
 extern CPU	cpus_PentiumPro[];
 extern CPU	cpus_PentiumII[];