Hide bcrypt_autorounds(), prefixing with an underbar for static builds.

verified that they are there via isdigit() so we can convert from
ASCII to an int without using atoi().  OK guenther@ deraadt@

C standard are all weak.
Apply __{BEGIN,END}_HIDDEN_DECLS to gdtoa{,imp}.h, hiding the
arch-specific __strtorx, __ULtox_D2A, __strtorQ, __ULtoQ_D2A symbols.

and the symbols not in the C standard are weak

Delete unused 'fd' argument from internal function oldttyname()

variables go direct.  (Common variables cannot be aliased.)

ok deraadt@

By default, MSVC's stdlib.h defines min(), so we need to spell out something
less common to avoid picking it up.
ok deraadt@ beck@ miod@

so that we can provide asm labels for the memcpy/memset/__stack_smash_handler
calls that it generates ab initio.  Eliminate direct #includes of it.  Make
sure it's a dependency of all objects (unnecessary for asm, but close enough).
ok deraadt@

to eliminate duplicate copies of the tables and get direct access internally
ok kettenis@ deraadt@

_cat* in the process.
ok kettenis@

wrapper .h files and asm labels to let internal calls resolve directly and
not be overridable or use the PLT.  Then, apply that framework to most of
the functions in stdio.h, string.h, err.h, and wchar.h.  Delete the
should-have-been-hidden-all-along _v?(err|warn)[cx]? symbols while here.
tests clean on i386, amd64, sparc64, powerpc, and mips64
naming feedback from kettenis@ and millert@
ok kettenis@

and __dorand48() and __rand48_deterministic
ok deraadt@

malloc/calloc/realloc* returns.

99% of the world calls it.
allow just "bcrypt" without params to mean auto-tune ("bcrypt,a").
default remains 8 rounds (for now)
ok deraadt

OK tedu@

ok deraadt jeremy

consistent with the behavior of the other libc sort functions.
OK deraadt@

when we can just make spanp const char * to match it.  OK deraadt@

part of the ISO C standard and have also been dropped from POSIX.
OK guenther@ kettenis@

of some undefined value.
OK tedu@

ok millert@ jmc@ schwarze@

separately to avoid false negatives.
ok miod@ millert@

unregistering callbacks if the DSO is unloaded.  Move the callback
handling from libpthread to libc, though libpthread still overrides the
inner call to handle locking and thread-library reinitialization.
Major version bump for both libc and libpthread.
verification that this fixes various ports ajacoutot@
asm assistance miod@; ok millert@ deraadt@

instead of simply zapping it. this can save many syscalls in a program
that repeatedly grows and shrinks a buffer, as observed in the wild.

for overflow. stop talking about old broken systems, there's little use
for such info.

Printing strerror() in that case will say result too large, even if rounds is
actually too small. invalid is less specific, but less incorrect.
ok millert

ok dlg

No actual change, but makes it easier to reuse the code elsewhere.
Suggested by Andre Smagin

to avoid swamping it;

ok tedu@

also fixing one typo in fts(3) while here

remove .Tn, and a few minor macro adjustments.
Patch from Kaspars at Bankovskis dot net.

friendlier for users. requested by deraadt