C++ xgcc for arm-none-eabi fails in 7.1, 7.2 due to undefined identifiers

[Freddie Chopin]

I forgot to say, that the procedure and resulting toolchain is closely
modeled after the one provided by ARM on:

https://developer.arm.com/open-source/gnu-toolchain/gnu-rm

It just has couple of tweaks like slightly different options for
newlib, completely disabled C++ exceptions and uses the most recent
versions of components.

Regards,
FCh