More proto fixes

Use a default, 'safe' address to map the loader to in case the an emulation-
specific probe function did not specify it. It picks the same address
as mmap() does for a non-fixed map at address 0. See

Use a default, 'safe' address to map the loader to in case the an emulation-
specific probe function did not specify it. It picks the same address
as mmap() does for a non-fixed map at address 0. See also the comment
around a similar line of code in vm/vm_mmap.c.

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* Don't rely on the protection bits of segments anymore to decide whether
it's text or data; use the entry point instead (this solves some trouble
with ELF executables with strange permissions)
*

* Don't rely on the protection bits of segments anymore to decide whether
it's text or data; use the entry point instead (this solves some trouble
with ELF executables with strange permissions)
* Incorporate some fixes from r_friedl@informatik.uni-kl.de sent to
netbsd-bugs a while ago

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s/memcmp/bcmp/

Remove unused define

Generic mi ELF loader; delete Linux and Svr4 compat conf entries and
add generic ELF entry to exec_conf.c