std lib test suite: fix some illegal behavior found by valgrind#24906

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Commits on Aug 19, 2025

lib/std/os/linux/test.zig: fadvise: don't write to file
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lib/std/os/linux/test.zig: futex v1: supply second pointer to CMP_REQUEUE
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lib/std/os/linux/IoUring.zig: write_fixed/read_fixed: initialize entire buffer
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lib/std/os/linux/IoUring.zig: disable false positive valgrind warning
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lib/std/os/linux/IoUring.zig: BufferGroup: get: disable valgrind warning

rpkak
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lib/std/os/linux/IoUring.zig: expect_buf_grp_cqe: uninitialized memory fix

rpkak
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lib/std/os/linux/IoUring.zig: test.waitid: initialize siginfo
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lib/std/os/linux/IoUring.zig: testSendRecv: disable valgrind warning
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lib/std/os/linux/IoUring.zig: test.statx: disable valgrind warning
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lib/std/math/big/int.zig: Mutable.mulWrapNoAlias: pass initialized rma.limbs slice
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