comment out new XOF optimizations

slow_xof.diff

diff --git a/src/platform.rs b/src/platform.rs
index cd8ef63..4452780 100644
--- a/src/platform.rs
+++ b/src/platform.rs
@@ -292,13 +292,13 @@ impl Platform {
             return;
         }
         match self {
-            // Safe because detect() checked for platform support.
-            #[cfg(blake3_avx512_ffi)]
-            #[cfg(unix)]
-            #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
-            Platform::AVX512 => unsafe {
-                crate::avx512::xof_many(cv, block, block_len, counter, flags, out)
-            },
+            // // Safe because detect() checked for platform support.
+            // #[cfg(blake3_avx512_ffi)]
+            // #[cfg(unix)]
+            // #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+            // Platform::AVX512 => unsafe {
+            //     crate::avx512::xof_many(cv, block, block_len, counter, flags, out)
+            // },
             _ => {
                 // For platforms without an optimized xof_many, fall back to a loop over
                 // compress_xof. This is still faster than portable code.