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pythongh-111046: for wasi-threads, export memory as well via the linker (pythonGH-111099)

(cherry picked from commit5dfa717)Co-authored-by: YAMAMOTO Takashi <yamamoto@midokura.com>

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	`1`	`+For wasi-threads, memory is now exported to fix compatibility issues with some wasm runtimes.`

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`@@ -2326,10 +2326,15 @@ AS_CASE([$ac_sys_system],`
`2326`	`2326`	`# without this, configure fails to find pthread_create, sem_init,`
`2327`	`2327`	`# etc because they are only available in the sysroot for`
`2328`	`2328`	`# wasm32-wasi-threads.`
	`2329`	`+ # Note: wasi-threads requires --import-memory.`
	`2330`	`+ # Note: wasi requires --export-memory.`
	`2331`	`+ # Note: --export-memory is implicit unless --import-memory is given`
	`2332`	`+ # Note: this requires LLVM >= 16.`
`2329`	`2333`	`AS_VAR_APPEND([CFLAGS],[" -target wasm32-wasi-threads -pthread"])`
`2330`	`2334`	`AS_VAR_APPEND([CFLAGS_NODIST],[" -target wasm32-wasi-threads -pthread"])`
`2331`	`2335`	`AS_VAR_APPEND([LDFLAGS_NODIST],[" -target wasm32-wasi-threads -pthread"])`
`2332`	`2336`	`AS_VAR_APPEND([LDFLAGS_NODIST],[" -Wl,--import-memory"])`
	`2337`	`+AS_VAR_APPEND([LDFLAGS_NODIST],[" -Wl,--export-memory"])`
`2333`	`2338`	`AS_VAR_APPEND([LDFLAGS_NODIST],[" -Wl,--max-memory=10485760"])`
`2334`	`2339`	`])`
`2335`	`2340`

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