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

* reintegrated posix-locale

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

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

* reintegrated posix-locale

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