We're using a few occurrences of __builtin_prefetch() but tcc doesn't
know about it so let's give it a dummy definition. Now the code builds
and works again with tcc without thread support.
#endif
#endif
+/* Define the missing __builtin_prefetch() for tcc. */
+#if defined(__TINYC__)
+#define __builtin_prefetch(addr, ...) do { } while (0)
+#endif
+
#ifndef __GNUC_PREREQ__
#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
#define __GNUC_PREREQ__(ma, mi) \