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${CMAKE_CROSSCOMPILING_EMULATOR} will be used in the new rv32 buildbot
and is prepended automatically when we call add_custom_target in CMake,
except when we use a custom command.
There are two places where custom commands are used in libc, so we
explicitly add the ${CMAKE_CROSSCOMPILING_EMULATOR} variable there.
Other systems that don't use ${CMAKE_CROSSCOMPILING_EMULATOR} are
unaffected