c++ source files in the build...

[DJ Delorie]

OTOH, I just ran into the next C++ roadblock... we have internal headers
that use the word "private" as a field, which of course doesn't work
with C++...

Is it worth fixing up all our internal headers and sources to be C++
compatible?  I.e. as a prelude to future C++ stuff?  In this case, it's
a utility to be installed alongside libc.so, not something inside
libc.so itself, but still...