[libc] remove errno.h includes (#110934)

diff --git a/libc/src/pthread/pthread_attr_setstacksize.cpp b/libc/src/pthread/pthread_attr_setstacksize.cpp
index f327d33..0a5d1af 100644
--- a/libc/src/pthread/pthread_attr_setstacksize.cpp
+++ b/libc/src/pthread/pthread_attr_setstacksize.cpp
@@ -10,8 +10,8 @@
 
 #include "src/__support/common.h"
 #include "src/__support/macros/config.h"
+#include "src/errno/libc_errno.h"
 
-#include <errno.h>
 #include <pthread.h>
 
 namespace LIBC_NAMESPACE_DECL {