Don't include libio.h from stdio.h.

The only thing stdio.h really needed libio.h for was the complete
definition of the FILE struct.  This is moved to
bits/types/struct_FILE.h, along with just enough ancillary definitions
for the inlines in bits/stdio.h.  stdio.h itself leaves FILE as an
opaque typedef; bits/types/struct_FILE.h will only be read when the
inlines are active.

Code within glibc that needs to see libio internal definitions should,
for the time being, include <libio/libioP.h>.  Once we stop shipping
libio.h as an exposed header, we can fold libio.h, libioP.h, and
iolibio.h together and much cruft will become unneccessary.

Unlike the earlier patch where I had us stop shipping libio.h
entirely, I left the struct _IO_FILE / struct _IO_FILE_complete
distinction strictly alone in this patch, so it shouldn't break old
ABI compatibility.  This is still quite messy, particularly where it
touches on the _IO_MTSAFE_IO mess; close review would be appreciated.

More automatic PLT bypassing is added for fwide, flockfile, and
funlockfile; the earlier patches were apparently not thorough enough.

	* libio/stdio.h: Don't include bits/libio.h.  Don't define getc or
	putc as macros.  Declare __underflow, __uflow, and __overflow here.

	* libio/bits/types/struct_FILE.h: New header containing the complete
	definitions of struct _IO_FILE and struct _IO_FILE_complete and a few
	ancillary definitions.
	* libio/Makefile: Install bits/types/struct_FILE.h.
	* libio/bits/stdio.h: Add multiple inclusion guard.  Include
	bits/types/struct_FILE.h.  Use getc, not _IO_getc; putc, not _IO_putc;
	__getc_unlocked_body, not _IO_getc_unlocked; __putc_unlocked_body, not
	_IO_putc_unlocked; __feof_unlocked_body, not _IO_feof_unlocked;
	__ferror_unlocked_body, not _IO_ferror_unlocked.
	* libio/bits/stdio2.h: Add multiple inclusion guard.
        Use getc_unlocked, not _IO_getc_unlocked.
	* libio/bits/libio.h: Allow inclusion by libioP.h, not stdio.h.
	Move __HAVE_COLUMN and _IO_file_flags to the set of compatibility
	defines.  Get definition of _IO_FILE and fallback definition of
	_IO_lock_t from bits/types/struct_FILE.h. Use macros from
	bits/types/struct_FILE.h for _IO_getc_unlocked, _IO_putc_unlocked,
	_IO_feof_unlocked, and _IO_ferror_unlocked.
	Remove some #if 0 blocks and redundant prototypes.  Only provide
	non-thread-safe fallback definitions of several macros when
	neither _IO_MTSAFE_IO nor _LIBC is defined.  Avoid unwanted macro
	expansion when declaring _IO_flockfile and _IO_funlockfile.
	* libio/libioP.h: Add multiple-include guard.  Include stdio.h and
	bits/libio.h.
	* libio/strfile.h: Include libio/libioP.h.

	* include/bits/libio.h: Move the libc_hidden_proto declarations
	for __woverflow, __wunderflow, __wuflow, _IO_free_backup_area,
	_IO_free_wbackup_area, _IO_padn, _IO_putc, _IO_sgetn, _IO_vfprintf,
	and _IO_vfscanf back here.  Add libc_hidden_proto declarations for
	_IO_flockfile, _IO_ftrylockfile, and _IO_funlockfile.
	* include/stdio.h: Use __gnuc_va_list instead of _G_va_list, __ssize_t
	instead of _IO_ssize_t, and FILE instead of _IO_FILE.  Don't redefine
	_IO_peekc.  Don't macro-redirect putc.  Define _IO_USER_LOCK here.
	Add libc_hidden_proto declarations for __flockfile, __funlockfile, and
	__ftrylockfile.  When IS_IN(libc), macro-redirect flockfile to
	__flockfile and funlockfile to __funlockfile.  When IS_IN(libc) and
	_IO_MTSAFE_IO, macro-redirect __flockfile to _IO_flockfile and
	__funlockfile to _IO_funlockfile.  Use __flockfile and __funlockfile
	in the expensive-lock variants of _IO_flockfile and _IO_funlockfile.
	* include/stdio_ext.h: Define _IO_USER_LOCK here.
	* include/wchar.h: When IS_IN(libc), macro-redirect fwide to _IO_fwide.
	* include/bits/types/struct_FILE.h: New wrapper.

	* argp/argp-fmtstream.c, argp/argp-help.c, misc/err.c, misc/error.c:
	Use fwide, not _IO_fwide.
	* resolv/res_init.c: Use ferror_unlocked, not _IO_ferror_unlocked.
	* stdio-common/scanf.c: Use __vfscanf, not _IO_vfscanf.
	* stdio-common/tstgetln.c: Get ssize_t from sys/types.h.
	* csu/init.c, libio/__fbufsize.c, libio/__flbf.c, libio/__fpending.c
	* libio/__freadable.c, libio/__fwritable.c, libio/__fwriting.c
	* malloc/malloc.c, misc/err.c, misc/error.c, stdio-common/perror.c
	Include libio/libioP.h instead of, or in addition to, stdio.h.
	* libio/fwide.c: #undef fwide before defining it as a function.

	* stdio-common/flockfile.c: Include stdio.h and libio/libioP.h and
	remove unnecessary headers.  #undef flockfile, __flockfile, and
	_IO_flockfile before defining __flockfile as a function.  Make
	_IO_flockfile a strong alias.  Add libc_hidden_def for __flockfile and
	_IO_flockfile.
	* stdio-common/ftrylockfile.c, stdio-common/funlockfile.c
	* sysdeps/pthread/flockfile.c, sysdeps/pthread/ftrylockfile.c
	* sysdeps/pthread/funlockfile.c: Similarly.

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