This makes it impossible to build libcrypt, so add a NEWS entry for
the removal at this point, and remove the prototype for crypt() from
unistd.h. Also removed at this point are a handful of references to
libcrypt in other directories (notably elf/, conform/, and SPARCv9
sysdep Makefiles) and in maintainer-facing scripts and docs.
stdio-common/Versions says that __snprintf is exported as
GLIBC_PRIVATE because libcrypt uses it. I doubt that was the only
ancillary library using that symbol, but I don't know how to find
other uses, so I left the export in place; it can always be removed
later.
There are a few files of test data that mention the crypt directory
and/or its contents, e.g. benchtests/strcoll-inputs/filelist#en_US.UTF-8.
As best I can tell, the intent of these is just to have a big pile of
strings and it doesn't matter whether the named files exist, so I
haven't altered them.
The actual code, and the remainder of the documentation, will be
deleted in subsequent patches.
(I seem to have a slightly different version of autoconf than the one
that was last used to regenerate the top-level configure script. If
that's a problem, let me know.)