fix some aarch64-musl libc loading issues

[angerman]

This is pretty annoying, as we end up calling gettimeofday and clock, which result in SEGVs due to the state of the in-memory loaded libc, and the linked in libc mismatching. Interning the symbols does work, but we need a better solution in 9.6. There is some experimentation in the armv7a branch, adding symbols into iserv, not GHC.