[patch] libstdc++/67066 disable concept checks for C++11 and up

[Jonathan Wakely]

This fixes a bootstrap failure with --enable-concept-checks, caused by
the Filesystem code (built as C++14) not meeting the C++03 concept
requirements for containers.

I think building with --enable-concept-checks is crazy nowadays but
this at least makes it possible.

Rather than trying to fix the concept checks to understand move-only
types I'm just disabling the relevant checks in C++11 mode.

Tested powerpc64le-linux, committing to trunk.

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