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The Linux target's sys/lock.h provided no-op inline stubs, which was safe only under the assumption of single-threaded execution. With the new FreeRTOS Linux simulator using soft preemption, an outgoing task can still run concurrently with the incoming task until it reaches a yield point, making no-op locks unsafe. Replace the no-op implementation with real pthread mutexes: - Change _lock_t from `typedef int` to `typedef void *` (pointer to a heap-allocated pthread_mutex_t). - Implement all _lock_* functions in a new lock.c, supporting both normal and recursive mutexes. - Zero-initialized locks are lazily created on first acquire using double-checked locking, preserving newlib/esp_libc semantics. - Add lock.c unconditionally to the linux component sources and link pthread.