[Bug c++/83931] Add support for -nostdlib++

[thomasanderson at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83931

--- Comment #2 from Thomas Anderson <thomasanderson at google dot com> ---
From the LLVM CL description:

Alternatively, they could use clang instead
of clang++, but that already disables implicit addition of -lm on some
toolchains.

Not sure if this is the same for gcc though.