libc/csu: Unify INIT_RELOCS across architectures

Some architectures don't need any arguments, whilst others need auxargs,
which they get by passing in env thanks to INIT_RELOCS referencing the
local

libc/csu: Unify INIT_RELOCS across architectures

Some architectures don't need any arguments, whilst others need auxargs,
which they get by passing in env thanks to INIT_RELOCS referencing the
local variable in __libc_start1(_gcrt) by name. This is unnecessarily
confusing, fragile (one has to look at INIT_IRELOCS's definition to see
that it uses env) and duplicates code between architectures.

Instead, implement it more like rtld-elf. Each architecture provides an
ifunc_init that takes the auxargs directly, and those that don't need it
can just ignore it.

Reviewed by: kib
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D47188

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libc/csu: Do not compile the finalizer() for PIC build

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D41148

lib/csu: do not compile the body of handle_static_init() for PIC build at all

The referenced symbols that provide init array boundaries are weak,
hidden, and undefined. The code that iterates over

lib/csu: do not compile the body of handle_static_init() for PIC build at all

The referenced symbols that provide init array boundaries are weak,
hidden, and undefined. The code that iterates over that arrays is not
used for the case when libc is compiled as dso.

This should fix linking with ld.bfd.

Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks

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libc/csu: rename ignore_init.c to libc_start1.c

The current name was a historical curiosity that started when init array
support was added, and then the file appeared a convenient place for the
addi

libc/csu: rename ignore_init.c to libc_start1.c

The current name was a historical curiosity that started when init array
support was added, and then the file appeared a convenient place for the
addition of the MI common code to csu. It is now referenced by name in
single place and the rename is easy, so do it.

Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks

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