silenc gcc Werror=logical-op

ref BLAKE3-team#379

/home/travis/build/php/php-src/ext/hash/blake3/upstream_blake3/c/blake3.c: In function ‘compress_subtree_to_parent_node’:

/home/travis/build/php/php-src/ext/hash/blake3/upstream_blake3/c/blake3.c:354:22: error: logical ‘and’ of mutually exclusive tests is always false [-Werror=logical-op]

  354 |   while (num_cvs > 2 && num_cvs <= MAX_SIMD_DEGREE_OR_2) {

      |                      ^~

cc1: all warnings being treated as errors

make: *** [Makefile:1910: ext/hash/blake3/upstream_blake3/c/blake3.lo] Error 1

c/blake3.c

@@ -351,7 +351,11 @@ INLINE void compress_subtree_to_parent_node(
   // is set on platforms where MAX_SIMD_DEGREE_OR_2 == 2, GCC emits spurious
   // warnings here. GCC 8.5 is particularly sensitive, so if you're changing
   // this code, test it against that version.
-  while (num_cvs > 2 && num_cvs <= MAX_SIMD_DEGREE_OR_2) {
+  while (num_cvs > 2
+#if MAX_SIMD_DEGREE_OR_2 > 2
+    && num_cvs <= MAX_SIMD_DEGREE_OR_2
+#endif
+  ) {
     num_cvs =
         compress_parents_parallel(cv_array, num_cvs, key, flags, out_array);
     memcpy(cv_array, out_array, num_cvs * BLAKE3_OUT_LEN);