main/vim: add workaround for bug in vim's LDFLAGS modification
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Starting with abuild-3.8.0_rc1, vim no longer builds with the default LDFLAGS value provided in /etc/abuild.conf. This is due to LDFLAGS modifications performed by vim's build system.
See https://github.com/vim/vim/issues/8181
With this commit --as-needed is no longer the last linker option. Not sure if this is relevant or not.