[hurd,commited] htl: Add missing include

[Samuel Thibault]

For IS_IN.
---
 sysdeps/htl/pthreadP.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sysdeps/htl/pthreadP.h b/sysdeps/htl/pthreadP.h
index 8ea60949ec..471a4cfa43 100644
--- a/sysdeps/htl/pthreadP.h
+++ b/sysdeps/htl/pthreadP.h
@@ -24,6 +24,7 @@
 #include <pthread.h>
 #include <link.h>
 #include <bits/cancelation.h>
+#include <libc-symbols.h>
 
 /* Attribute to indicate thread creation was issued from C11 thrd_create.  */
 #define ATTR_C11_THREAD ((void*)(uintptr_t)-1)
-- 
2.51.0