Update arch macros.

sdl_handmade.cpp

@@ -1,4 +1,3 @@
-#include "base_context_cracking.h"
 #include "base_core.h"
 #include "sdl_handmade.h"
 #include "handmade.cpp"
@@ -13,7 +12,7 @@
 #include <unistd.h>   // close, read
 
 // NOTE: This is so it compiles on ARM.
-#if ARCH_X64 || ARCH_X86
+#if __x86_64__ || __i386__ 
 #include <x86intrin.h>
 #endif
 
@@ -383,14 +382,14 @@ S32 main(int argc, char *argv[])
                 GlobalPerfCountFrequency = SDL_GetPerformanceFrequency();
 
                 U64 LastCounter;
-#if ARCH_X64 || ARCH_X86
+#if __x86_64__ || __i386__ 
                 U64 LastCycleCount;
 #endif
 
                 while(GlobalRunning) {
                     LastCounter = SDLGetWallClock();
 
-#if ARCH_X64 || ARCH_X86
+#if __x86_64__ || __i386__ 
                     LastCycleCount = __rdtsc(); // NOTE: rdtsc reports clock cylces, however it is not meant for really precise profiler work as the value returned is varied.
 #endif                                          // Also, __rdtsc is not available on MacOS ARM; I have not checked MacOS x64.
 
@@ -507,7 +506,7 @@ S32 main(int argc, char *argv[])
 
                     LastCounter = EndCounter;
 
-#if ARCH_X64 || ARCH_X86
+#if __x86_64__ || __i386__ 
                     U64 EndCycleCount = __rdtsc();
                     U64 CyclesElapsed = EndCycleCount - LastCycleCount;
                     F64 MCPF = ((F64)CyclesElapsed / (1000.0f * 1000.0f));