libs/posix: Implemented new locale functions

Implemented the missing POSIX functions in <locale.h>:
newlocale, duplocale, uselocale, and freelocale, and also
provided missing type definitions for <locale.h>.

Implemented missing POSIX locale-based function variants.

Modified LocaleBackend so that it could support thread-local
locales.

Some glibc-like locale-related variables supporting
ctype and printf family of functions have also been updated
to reflect the thread-local variables present in the latest
glibc sources.

As there have been some modifications to global symbols
in libroot, libroot_stubs.c has been regenerated.

Bug: #17168
Change-Id: Ibf296c58c47d42d1d1dfb2ce64042442f2679431
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5351
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

s/Haiku License/MIT License/g.

They are the same thing.

wctype: have towlower and towupper check char ranges with no locale backend.

Change-Id: Ie63977bcf54ce9b0a2fa542ba5327c8e8b050e2e
Reviewed-on: https://review.haiku-os.org/740
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

wctype: out of bound access in POSIX locale.

The POSIX locale has gLocaleRoster = NULL and relies on the non-wide
version of the implementation. However it doesn't check that the
characters are actually in range which leads to out of bound access and
crashes in __isctype.

Fixes #11322.

Fix behaviour of towlower(), towupper() and towctrans():

* all those functions need to return the given wc unchanged in case of
error, not 0
* towctrans() didn't actually look at the requested transition, but
always acted as if _ISlower was given

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

* Merged weak-symbols branch.
* Fixed trivial merge conflict in src/system/libroot/posix/locale/nl_langinfo.cpp
* Fixed gcc 2 compilation of src/system/glue/init_term_dyn.c.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39571 a95241bf-73f2-0310-859d-f6bbb57e9c96

* don't use B_USE_POSITIVE_POSIX_ERRORS in libroot, let any interested party
use that and the posix_error_mapper

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37737 a95241bf-73f2-0310-859d-f6bbb57e9c96

* reintegrated posix-locale

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37725 a95241bf-73f2-0310-859d-f6bbb57e9c96

wctype: out of bound access in POSIX locale.

The POSIX locale has gLocaleRoster = NULL and relies on the non-wide
version of the implementation. However it doesn't check that the
characters are actually in range which leads to out of bound access and
crashes in __isctype.

Fixes #11322.

Fix behaviour of towlower(), towupper() and towctrans():

* all those functions need to return the given wc unchanged in case of
error, not 0
* towctrans() didn't actually look at the requested transition, but
always acted as if _ISlower was given

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

* Merged weak-symbols branch.
* Fixed trivial merge conflict in src/system/libroot/posix/locale/nl_langinfo.cpp
* Fixed gcc 2 compilation of src/system/glue/init_term_dyn.c.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39571 a95241bf-73f2-0310-859d-f6bbb57e9c96

* don't use B_USE_POSITIVE_POSIX_ERRORS in libroot, let any interested party
use that and the posix_error_mapper

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37737 a95241bf-73f2-0310-859d-f6bbb57e9c96

* reintegrated posix-locale

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37725 a95241bf-73f2-0310-859d-f6bbb57e9c96