[patch] libstdc++/68912 Fix cv-qualifiers in std::bind invocation

[Jonathan Wakely <jwakely at redhat dot com>]

The first patch fixes an inconsistency between the return type and the
function body, as described in the PR.

The second patch removes the TR1 return type support from _Mu, because
it isn't necessary in C++11. The third patch is because the second one
accidentally removed a "volatile" (removing that is fine, because we
never create volatile _Mu, or even a const one, but no point removing
it on only one specialization and leaving it elsewhere).

Tested powerpc64le-linux.

I've committed both to trunk and will apply the first patch (but not
the second and third) to the branches too.

Attachment: patch1.txt
Description: Text document

Attachment: patch2.txt
Description: Text document

Attachment: patch3.txt
Description: Text document