LibC: Move pthread keys to TCB

This removes all TLS relocations from libc which may become handy ;)

userspace/libraries/LibC/include/bits/types/pthread_key_t.h

@@ -0,0 +1,14 @@
+#ifndef _BITS_TYPES_PTHREAD_KEY_H
+#define _BITS_TYPES_PTHREAD_KEY_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/pthread.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+typedef unsigned pthread_key_t;
+
+__END_DECLS
+
+#endif

userspace/libraries/LibC/include/bits/types/pthread_types.h

@@ -8,14 +8,13 @@
 __BEGIN_DECLS
 
 #include <bits/types/pthread_attr_t.h>
+#include <bits/types/pthread_key_t.h>
 #include <bits/types/pthread_t.h>
 
 #include <stdint.h>
 
 typedef int pthread_once_t;
 
-typedef unsigned pthread_key_t;
-
 typedef pthread_t pthread_spinlock_t;
 
 typedef struct

userspace/libraries/LibC/include/bits/types/uthread.h

@@ -8,7 +8,9 @@ __BEGIN_DECLS
 #define __need_size_t
 #include <sys/types.h>
 
+#include <bits/types/pthread_key_t.h>
 #include <bits/types/pthread_t.h>
+#include <limits.h>
 #include <stdint.h>
 
 typedef struct _pthread_cleanup_t
@@ -44,6 +46,8 @@ struct uthread
 	int cancel_type;
 	int cancel_state;
 	volatile int canceled;
+	pthread_key_t specific_keys[PTHREAD_KEYS_MAX];
+	void* specific_values[PTHREAD_KEYS_MAX];
 	// FIXME: make this dynamic
 	uintptr_t dtv[1 + 256];
 };