[zircon][gn] Use AS_NEEDED for libc++.so
This avoids the extra DT_NEEDED entry even in cases where libc++.so isn't needed. This is also consistent with Clang driver implementation which uses --as-needed around libc++.so. Bug: ZX-4099 Change-Id: I76475896b7ea2c825a97f28b7b09e53228b468c6
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