Bootstrap build problem after V8 test-in-container patch".

[DJ Delorie]

Steve Ellcey <sellcey@cavium.com> writes:
> /home/sellcey/tot/install/lib/gcc/aarch64-linux-gnu/9.0.0/../../../../aarch64-linux-gnu/bin/ld: cannot find -lstdc++

I had similar problems (with libgcc_s.so.1) during my testing; my code
assumes that if CXX is set to g++, then g++ works.  I'm working with
Carlos to come up with a better way of handling that one program.