Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

MFV r282150
libgomp: Update to version 4.3.5.

This is a partial revert of r282115, to bring the fromal upstream
libgomp from GCC 4.3.5 Release under LGPLv2.1+.

This is only brought to ease the ongoing development of the CPU
affinity support.

This shall not be MFC'd.

Bring updated versions of libcpp and libgomp.

While GCC 4.3 changed license, the library components remained under
LGPLv2.1 all the during all the existence of the branch.
From gcclibs, only libcpp and libgomp have some value for us in the base
gcc 4.2.1: bring updated versions from GCC 4.3.5 as reference as we have
already been including some of the fixes.

These not expected to become part of any FreeBSD release.