SCons: Properly set SSE2 as baseline on x86_32

Setting it only for release templates on Windows and macOS was inconsistent,
and Jolt requires it as a minimum.

Drop the `-mxsave` flag from the raycast module, this doesn't seem to be
used explicitly by Embree, and unnecessarily makes our config and baseline
muddy.

platform/windows/detect.py

@@ -701,11 +701,7 @@ def configure_mingw(env: "SConsEnvironment"):
         print("Detected GCC to be a wrapper for Clang.")
         env["use_llvm"] = True
 
-    # TODO: Re-evaluate the need for this / streamline with common config.
-    if env["target"] == "template_release":
-        if env["arch"] != "arm64":
-            env.Append(CCFLAGS=["-msse2"])
-    elif env.dev_build:
+    if env.dev_build:
         # Allow big objects. It's supposed not to have drawbacks but seems to break
         # GCC LTO, so enabling for debug builds only (which are not built with LTO
         # and are the only ones with too big objects).