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doc: Prefer https urls where possible.

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* doc/multithread.texi: Use https instead of http where possible.
* doc/glibc-functions/*.texi: Likewise.
* doc/posix-functions/*.texi: Likewise.
* lib/glthread/lock.c: Likewise.
* lib/hamt.h: Likewise.
* lib/localcharset.c: Likewise.
* lib/pipe2.c: Likewise.
* lib/pipe.c: Likewise.
* lib/sigsegv.c: Likewise.
* lib/sigsegv.in.h: Likewise.
* lib/sm3.c: Likewise.
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* lib/sm3-stream.c: Likewise.
* lib/stackvma.c: Likewise.
* lib/stdio-impl.h: Likewise.
* lib/stdnoreturn.in.h: Likewise.
* m4/getopt.m4: Likewise.
* m4/largefile.m4: Likewise.
* m4/stdalign.m4: Likewise.
* STATUS-libposix: Likewise.
* tests/test-float.c: Likewise.
* tests/test-getopt.h: Likewise.
* tests/test-setenv.c: Likewise.
* tests/test-spawn-pipe-child.c: Likewise.
* tests/test-strerror.c: Likewise.
* tests/test-strerror_r.c: Likewise.
* tests/test-unsetenv.c: Likewise.
* users.txt: Likewise.

doc/posix-functions/timespec_getres.texi

@node timespec_getres
@subsection @code{timespec_getres}
@findex timespec_getres

ISO C23 specification:@* @url{https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf} section 7.29.2.7

Gnulib module: timespec_getres
@mindex timespec_getres

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
glibc 2.33, macOS 12, FreeBSD 14.0, NetBSD 9.2, OpenBSD 7.0, Minix 3.3.0, AIX 7.1, HP-UX 11.31, Solaris 11.3, Cygwin 2.9, mingw, MSVC 14, Android API level 34.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
On some platforms, this function returns a value other than the clock
resolution of @code{timespec_get}, i.e., the minimum distance between
differing timestamps.  For example, on GNU/Linux it typically returns
1 nanosecond regardless of the actual clock resolution.
@end itemize

@mindex gettime-res
The Gnulib module @code{gettime-res} is a partial substitute; it implements
the @code{TIME_UTC} functionality of @code{timespec_getres}.