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/usr/include/newlib/sys/lock.h is in libnewlib-dev 2.4.0.20160527-2.

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#ifndef __SYS_LOCK_H__
#define __SYS_LOCK_H__

/* dummy lock routines for single-threaded aps */

typedef int _LOCK_T;
typedef int _LOCK_RECURSIVE_T;
 
#include <_ansi.h>

#define __LOCK_INIT(class,lock) static int lock = 0;
#define __LOCK_INIT_RECURSIVE(class,lock) static int lock = 0;
#define __lock_init(lock) (_CAST_VOID 0)
#define __lock_init_recursive(lock) (_CAST_VOID 0)
#define __lock_close(lock) (_CAST_VOID 0)
#define __lock_close_recursive(lock) (_CAST_VOID 0)
#define __lock_acquire(lock) (_CAST_VOID 0)
#define __lock_acquire_recursive(lock) (_CAST_VOID 0)
#define __lock_try_acquire(lock) (_CAST_VOID 0)
#define __lock_try_acquire_recursive(lock) (_CAST_VOID 0)
#define __lock_release(lock) (_CAST_VOID 0)
#define __lock_release_recursive(lock) (_CAST_VOID 0)

#endif /* __SYS_LOCK_H__ */