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gh-91048: Prevent optimizing away the asyncio debug offsets structure on Windows (#132963)

To avoid having the debug sections being optimised away by the compilerwe use __attribute__((used)) on gcc and clang but in Windows this isnot supported by the Microsoft compiler and there is no equivalent flag.Unfortunately Windows offers almost no alternative other than exportingthe symbol in the dynamic table or using it somehow.

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`‎Modules/_asynciomodule.c`

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Original file line number	Diff line number	Diff line change
`@@ -185,6 +185,10 @@ typedef struct {`
`185`	`185`	`/* Counter for autogenerated Task names */`
`186`	`186`	`uint64_ttask_name_counter;`
`187`	`187`
	`188`	`+/* Pointer to the asyncio debug offset to avoid it to be optimized away`
	`189`	`+ by the compiler */`
	`190`	`+void*debug_offsets;`
	`191`	`+`
`188`	`192`	`}asyncio_state;`
`189`	`193`
`190`	`194`	`staticinlineasyncio_state*`
`@@ -4320,6 +4324,8 @@ module_init(asyncio_state *state)`
`4320`	`4324`	`gotofail;`
`4321`	`4325`	`}`
`4322`	`4326`
	`4327`	`+state->debug_offsets=&_AsyncioDebug;`
	`4328`	`+`
`4323`	`4329`	`Py_DECREF(module);`
`4324`	`4330`	`return0;`
`4325`	`4331`

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`‎Modules/_asynciomodule.c`

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