shims: TAILQ_FOREACH_SAFE is unavailable in glibc

TAILQ_FOREACH_SAFE is a BSD specific macro.  Provide a definition for it
in the Linux shims.

Author: compnerd

src/shims/linux_stubs.h

@@ -16,6 +16,16 @@
 #ifndef __DISPATCH__STUBS__INTERNAL
 #define __DISPATCH__STUBS__INTERNAL
 
+#if !defined(TAILQ_FOREACH_SAFE)
+#define TAILQ_FOREACH_SAFE(var, head, field, temp)                             \
+	for ((var) = TAILQ_FIRST((head));                                      \
+		(var) && ((temp) = TAILQ_NEXT((var), field), 1); (var) = (temp))
+#endif
+
+#if !defined(TRASHIT)
+#define TRASHIT(x) do { (x) = (void *)-1; } while (0)
+#endif
+
 /*
  * Stub out defines for some mach types and related macros
  */