lib/csu: Add ifunc support for statically linked programs.

This assumes that both _init_tls() and _rtld_call_init() paths in libc
will not contain ifunc calls. For now should be enough since ther

lib/csu: Add ifunc support for statically linked programs.

This assumes that both _init_tls() and _rtld_call_init() paths in libc
will not contain ifunc calls. For now should be enough since there was
no ifunc support previously.

Derived-from: NetBSD crt0-common.c implementation

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