eng/common: detect FreeBSD/powerpc64le#17062
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* native/init-os-and-arch.sh: on FreeBSD use `uname -p` to determine the CPU (uname -m returns "powerpc" for every PowerPC variant) and accept powerpc64le. * cross/toolchain.cmake: emit the FreeBSD clang target triple for ppc64le.
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Teaches the shared eng/common native bootstrap to identify FreeBSD on PowerPC. (eng/common is vendored into the product repos from here, so this is the canonical place for the fix.)
eng/common/native/init-os-and-arch.sh: on FreeBSD, derive the CPU fromuname -p.uname -mreturns "powerpc" for every PowerPC variant (32/64-bit, BE/LE), which the existing logic rejects as an unknown CPU. Adds the powerpc64le case.eng/common/cross/toolchain.cmake: emit the FreeBSD clang target triple for the ppc64le cross toolchain.Testing: used to cross-build and then natively source-build the v9.0.115 VMR on FreeBSD/ppc64le. Part of a FreeBSD/powerpc64le (ppc64le) port. Sibling PRs: dotnet/runtime (PAL/platform), dotnet/arcade (eng/common detection), dotnet/sdk, dotnet/fsharp.
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