Sharing the crt sources with i386-elf wasn't too successful. The crti

asm code didn't link the way it was supposed to and the calling convention
for the entry "function" turned out to be very different. On alpha
it's a true function, but on i386 it's a fudge. Blech.

So jdp suggested keeping separate sets of source and avoiding lots
of #ifdefs. These files are based on his i386-elf code, with crt1.c
borrowing code from NetBSD's crt0. The copyright reflects that.

Complicating matters, the code turned out to be difficult to bootstrap
build using NetBSD tools. To compile against the FreeBSD rtld header
requires FreeBSD specific headers, but these can't be installed until
the tools are built, and they can't be built without the FreeBSD crt
objects. Anal retentive. So I introduced a HAVE_RTLD #define that isn't
set during the build process until all the tools are built and the
headers installed.

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