move the build of ldd binary to a subdir in order to allow
explict ordering. This makes "make all" work the same as
"make dependall"

Add basic locking to ld.elf_so.

Add TLS support infrastructure. For dynamic binaries, ld.elf_so exports
_rtld_tls_allocate and _rtld_tls_free. libpthread uses this functions to
setup the thread private area of all new threads. ld.e

Add TLS support infrastructure. For dynamic binaries, ld.elf_so exports
_rtld_tls_allocate and _rtld_tls_free. libpthread uses this functions to
setup the thread private area of all new threads. ld.elf_so is
responsible for setting up the private area for the initial thread.
Similar functions are called from _libc_init for static binaries, using
dl_iterate_phdr to access the ELF Program Header.

Add test cases to exercise the different TLS storage models. Test cases
are compiled and installed on all platforms, but are skipped on
platforms not marked for TLS support.

This material is based upon work partially supported by
The NetBSD Foundation under a contract with Joerg Sonnenberger.

It is inspired by the TLS support in FreeBSD by Doug Rabson and the
clean ups of the DragonFly port of the original FreeBSD modifications.

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Implement dl_iterate_phdr.

Somewhat taken from FreeBSD. Manual page from OpenBSD.

Sync against new ld.elf_so

kill ldd_aout. it didn't work anyway...not since i don't know when.

- rework this a bunch to make it work inside /rescue/ldd.
- fix alpha build.