CompilerFailure: llvm can't build C++11 either
mpd: specify libc++ for clang

Closes #28399.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
newlisp 10.6.0

Closes #28400.
jenkins 1.559

Closes #28394.

Signed-off-by: Brett Koonce <koonce@gmail.com>