Make private async_context_*_execute_sync static #2679
      
        
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Fixes #2678
The FreeRTOS, Poll, and Threadsafe async_context implementations have execute_sync functions that's set as a member of their async_context_type_t struct for use by the user-visible async_context API. These implementation functions should not be accessible by user code which chouls only use async_context_execute_sync and not the low-lever async_context_{freertos,poll,threadsafe}_execute_sync implementation.
Make these private functions static like the other low-level functions in the async_context_type_t struct.