[compiler-rt] Switch LLD specific tests to a more precise option (#69781)

Prefer the new flag -lld-allow-duplicate-weak (which was added recently
in a67ae8c0fd301a11e2a058e8035304cfc70a3e91), over the old -lldmingw.

The -lldmingw option enables a number of different behaviours, while
this test only is interested in one aspect of them.

This should allow making -lldmingw more strict with not enabling MSVC
specific behaviours like inferring lib directories automatically from
the environment, as being pursued in https://reviews.llvm.org/D144084.

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