Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update libstdc++ with small updates from the latest rev. (135556)
from the gcc 4.2 branch.
The libraries in the gcc-4_2-branch remained under the LGPLv2.

The changes can be reproduced with the following command:

svn diff svn://gcc.gnu.org/svn/gcc/branches/gcc-4_2-branch/libstdc++-v3
-r 127959:135556

Reviewed by: mm
Approved by: jhb (mentor)
MFC after: 2 weeks

Remove empty directories from the HEAD.

Discussed with: developers, imp

This commit was generated by cvs2svn to compensate for changes in r169691,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r132720,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r124154,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r117397,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r102782,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r97403,
which included commits to RCS files with non-trunk default branches.