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Thomas Watson
5f5673b58f
`__main_thread_stack_base__` and `__main_thread_stack_end__` are variables whose address is defined to be the corresponding part of the stack. These are declared as `extern stkalign_t` in ChibiOS code, and being declared as `extern uint32_t` in ArduPilot code creates a warning at link time when using LTO. Correct the declaration to eliminate this warning. Also update `__main_stack_base__` and `__main_stack_end__` which don't currently trigger this warning but serve similar purposes and so might in the future. The hardware expects an alignment of `stkalign_t` (which is 8 bytes) and the linker script defines the variable values with this alignment as well, so this is safe. No code size or functional change.