HostFeatures: Reenable 3DNow! now that it is fixed

With PR #5863, the bug that was breaking rendering in d3dx9 and Fallout
New Vegas is now resolved. This means we can now enable the feature by
default again as all known bugs are resolved.

With 3DNow! and full x87 softfloat enabled in FO:NV inside of the starting house. The game is
running at around 40-43FPS, doing ~22.6 to 34 million soft float
operations per second.

With 3DNow! disabled the game is running 30-31FPS, doing ~24-50 million
softfloat operations per second.

In both cases if x87 reduced precision is enabled then the game is
running at around 108-113FPS with zero softfloat instances getting
counted. Can't see the performance difference at that speed.

Source/Common/HostFeatures.cpp

@@ -537,6 +537,7 @@ void FetchHostFeatures(FEX::CPUFeatures& Features, FEXCore::HostFeatures& HostFe
   }
 #endif
 
+  HostFeatures.Supports3DNow = true;
   HostFeatures.SupportsAVX = true;
   HostFeatures.SupportsAES256 = HostFeatures.SupportsAVX && HostFeatures.SupportsAES;
   HostFeatures.SupportsPreserveAllABI = FEX_HAS_PRESERVE_ALL_ATTR;
@@ -553,15 +554,6 @@ void FetchHostFeatures(FEX::CPUFeatures& Features, FEXCore::HostFeatures& HostFe
     WARN_ONCE_FMT("Host CPU doesn't support atomics. Expect bad performance");
   }
 
-#ifdef _WIN32
-  // Disable 3DNow! by default to better match the set of extensions exposed on modern CPUs.
-  // This works around a bug that manifests in some games using native d3dx9 DLLs (most easily reproduced in WoW64 builds).
-  // For example, Fallout: New Vegas and some old EA games will run with a blackscreen.
-  HostFeatures.Supports3DNow = false;
-#else
-  HostFeatures.Supports3DNow = true;
-#endif
-
 #ifdef ARCHITECTURE_arm64
   // Test if this CPU supports float exception trapping by attempting to enable
   // On unsupported these bits are architecturally defined as RAZ/WI