Testing hwloc cc#1598
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PR oneapi-src#1585 forwards CC=${CMAKE_C_COMPILER}/CXX=${CMAKE_CXX_COMPILER} into hwloc's ExternalProject_Add autogen.sh/configure invocation, but those are bare compiler paths with no notion of CMAKE_SYSROOT or CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN. When UMF_LINK_HWLOC_STATICALLY is combined with a sysroot- or toolchain-file-pinned compiler, hwloc still ends up built against the host's headers/libs instead of the sysroot's, which can produce ABI mismatches (e.g. undefined glibc symbols) at final link time. CC/CXX are passed to autotools as space-separated "compiler [flags...]" strings (the same convention as CC="ccache gcc"), so --sysroot and --gcc-toolchain can be appended directly without needing wrapper scripts or touching CMAKE_C_COMPILER/CMAKE_CXX_COMPILER themselves. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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testing nightly of: #1597