libc: Sort SRCS in stdio/.

libc: Fix installation of fopencookie.3 man page

Meanwhile, fix the MLINKS error of having odd number of items, which was
causing the warning: 'warn: empty MLINK: yp_unbind.3 3'

libc/fopencookie: Additional fix which I forgot in a431bfe52a2aad0a18c.

Fixes buildworld.

<stdio.h>: Fix issues introduced with the fopencookie() changes.

a765cedf26cef470ba7deee42c365f0221690a1a added fopencookie() and
associated types from FreeBSD but it introduced a number of issues:

<stdio.h>: Fix issues introduced with the fopencookie() changes.

a765cedf26cef470ba7deee42c365f0221690a1a added fopencookie() and
associated types from FreeBSD but it introduced a number of issues:

* Wrong parentheses caused it to try to (re-)typedef the ssize_t type.
Fixed by removing parentheses and using __ssize_t. This fixes
graphics/png as pointed out by David Shao. ssize_t isn't available
in the compilation environment that graphics/png uses.

* Use off_t which is 64 bits in DragonFly. No need for off64_t.

* Put everything under __BSD_VISIBLE because it is not standard.

* While here, bump the manpage's date properly.

Reported-by: David Shao
Dragonfly-bug: <https://bugs.dragonflybsd.org/issues/3343>

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fopencookie(3): Add a wrapper around funopen(3)

- Minor adjustment to _flags since ours reside on the public
interface.
- Untested. A unit test would be a good thing to have :)

Taken from :

fopencookie(3): Add a wrapper around funopen(3)

- Minor adjustment to _flags since ours reside on the public
interface.
- Untested. A unit test would be a good thing to have :)

Taken from : FreeBSD 877a840c080f
FreeBSD-Review: https://reviews.freebsd.org/D6282

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printf(3)/scanf(3): Make ll and L length modifiers equivalent.

POSIX defines L only for floating point numbers (long double) and ll only
for integer numbers (long long), leaving for example %Ld or %

printf(3)/scanf(3): Make ll and L length modifiers equivalent.

POSIX defines L only for floating point numbers (long double) and ll only
for integer numbers (long long), leaving for example %Ld or %llg
undefined. GCC allows these non-portable combinations as an extension,
i.e. -Wformat will not warn about them unless -pedantic is passed.

To avoid surprises with Linux code, go with glibc and make ll and L
equivalent. For base code, we still prefer going with the standard, of
course.

Interestingly, the alternate printf(3) implementation in libc (enabled
by defining USE_XPRINTF in the environment) already treats them equally.

In-discussion-with: zrj

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libc: Remove libc checks around manual pages from the Makefile.inc's.

Handle this better by setting NOMAN for libc_rtld.