build

Introduce hints to ABI_FILE to select fat binary entries #86

Job	Run time
build ubuntu-24.04 clang-18	1m 41s
build asan+lsan ubuntu-24.04 clang-18	1m 21s
build ubsan ubuntu-24.04 clang-18	2m 47s
build tsan ubuntu-24.04 clang-18	2m 24s
build ubuntu-latest clang-15	1m 40s
build macos-latest clang-19	2m 33s
build asan+lsan macos-latest clang-19	2m 49s
build ubsan macos-latest clang-19	2m 13s
build tsan macos-latest clang-19	7m 21s
	24m 49s

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