fix(symbolize): use correct size_t format specifier

While compiling under Emscripten with _LP64 being 0, Clang complains
that the format specifier does not match the actual type (even though
size_t and unsigned are probably compatible.)

src/symbolize.cc

@@ -249,8 +249,10 @@ bool GetSectionHeaderByName(int fd, const char *name, size_t name_len,
     }
     char header_name[kMaxSectionNameLen];
     if (sizeof(header_name) < name_len) {
-      RAW_LOG(WARNING, "Section name '%s' is too long (%" PRIuS "); "
-              "section will not be found (even if present).", name, name_len);
+      RAW_LOG(WARNING,
+              "Section name '%s' is too long (%zu); "
+              "section will not be found (even if present).",
+              name, name_len);
       // No point in even trying.
       return false;
     }