Replace std::trunc() with trunc() to support cross-compiling

src/runtime/runtime-simd.cc

Index: src/runtime/runtime-simd.cc
diff --git a/src/runtime/runtime-simd.cc b/src/runtime/runtime-simd.cc
index 2de703968f42cde442122f41515cc712e4f58f51..70bc950150ae5b3c2719f480cfc438ab27350396 100644
--- a/src/runtime/runtime-simd.cc
+++ b/src/runtime/runtime-simd.cc
@@ -26,7 +26,7 @@ static bool CanCast(F from) {
   // A float can't represent 2^31 - 1 or 2^32 - 1 exactly, so promote the limits
   // to double. Otherwise, the limit is truncated and numbers like 2^31 or 2^32
   // get through, causing any static_cast to be undefined.
-  from = std::trunc(from);
+  from = trunc(from);
   return from >= static_cast<double>(std::numeric_limits<T>::min()) &&
          from <= static_cast<double>(std::numeric_limits<T>::max());
 }