libio: Add nonnull attribute for most FILE * arguments in stdio.h
During the review of a GCC analyzer test case, we found most stdio
functions accepting a FILE * argument expect it to be nonnull and just
segfault when the argument is NULL. Add nonnull attribute for them.
fflush and fflush_unlocked are well defined when __stream is NULL so
they are not touched.
For fputs, fgets, fread, fwrite, fprintf, vfprintf, and their unlocked
version, if __stream is empty but there is nothing to read or write,
they did not segfault. But the standard disallow __stream to be empty
here, so nonnull attribute is also added for them. Note that this may
blow up some old code already subtly broken.
Also add __nonnull for _chk variants and __fortify_function versions for
them.