tests/libexec/ld.elf_so: Fix helper library makefiles.
1. Consolidate logic into a single helper.mk to reduce duplication. 2. Set NO* variables, not MK* variables which are reserved for user. 3. Avoid eager X!= in favour of lazy ${X:sh}. 4. Mark _g.a set list entries obsolete. Never should've been built!
PR misc/57462
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