Bug 23161 – __mode_t defined twice for musl for non x86 arches

Compilation fails for aarch64 for ldc 1.29.0 on alpine linux which includes a bundled druntime https://gitlab.alpinelinux.org/a16bitsysop/aports/-/jobs/737278#L468 If Musl is detected __mode_t is defined here: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L1660 But it is also defined for HPPA: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L170 RISCV: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L486 ARM: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L568 Aarch64: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L663 Sparc: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L749 S390: https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L841 SystemZ https://github.com/dlang/druntime/blob/9b17410d08b6dd280f71603124519d91c4a4a4d5/src/core/sys/posix/sys/stat.d#L917 Currently ldc only compiles on alpine for x86_64 and aarch64

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